The story of the destruction of Koenigsberg by the twin
monitors Severn and Mersey in the Rufigi Delta, has an
interest that far transcends the intrinsic military importance
of depriving the enemy of a cruiser already
useless in sea war. For the narrative of events will
bring to our attention at once the extreme complexity
and the diversity of the tasks that the Royal Navy in
war is called upon to discharge. It is worth examining
in detail, if only to illustrate the novelty of the operations
which officers, with no such previous experience, may at
any moment be called upon to undertake, and the extraordinary
combination of patience, courage, skill, and
energy with which when experience at last comes, it
is turned to immediate profit. The incident possesses,
besides, certain technical aspects of the very highest
importance. For it gives in its simplest form perfect
examples of how guns should not and should be used
when engaged in indirect fire, and by affording this
illuminating contrast, is highly suggestive of the progress
that may be made in naval gunnery when scientific method
is universally applied. The incident, then, is worth
setting out and examining in some detail, and there is
additional reason for doing this, in that the accounts
that originally appeared were either altogether inaccurate
or so incomplete as to be misleading. First, then, to a
narrative of the event itself.
Koenigsberg was a light unarmoured cruiser of about
3,400 tons displacement, and was laid down in December
1905. She carried an armament of ten 4.1-inch guns, and
was protected by a 2-inch armoured deck. The Germans
had begun the construction of vessels of this class about
seven years before with Gazelle, which was followed in the
next year by Niobe and Nymphe, and then by four more—including
Ariadne, destroyed by Lion in the affair of the
Heligoland Bight—which were laid down in 1900. Two
years later came the three Frauenlobs, and the Bremen
class—five in number—succeeded these in 1903–4. In
1905 followed Leipzig, Danzig, and finally the ship that
concerns us to-day. All these vessels had the same armament,
but in the six years the displacement had gone up
1,000 tons. The speed had increased from 21½ knots to
about 24, and the nominal radius of action by about 50
per cent. Koenigsberg was succeeded by the Stettins in
1906–7, the two Dresdens in 1907–8, the four Kolbergs in
1908–9, and the four Breslaus in 1911. Karlsruhe, Grodenz,
and Rostock were the only three of the 1912–13 programmes
which were completed when the war began.
The process of growth, illustrated in the advance of Koenigsberg
over Niobe, was maintained, so that in the Karlsruhe
class in the programme of 1912, while the unit of
armament is preserved, we find that the number of guns
had grown from ten to twelve; the speed had advanced
from 23½ to 28 knots, and the displacement from 3,400
to nearly 5,000 tons. As we know now, in the Battle of
Jutland we destroyed light cruisers of a still later class in
which, in addition to every other form of defence, the armament
had been changed from 4.1-inch to 6.7 guns.
Koenigsberg, on the very eve of the outbreak of war, was
seen by three ships of the Cape Squadron off Dar-es-Salaam,
the principal port of German East Africa. She
was then travelling due north at top speed, and was not
seen or heard of again until, a week later, she sank the
British steamer City of Winchester near the island of Socotra.
There followed three weeks during which no news
of her whereabouts reached us. At the end of the month
it was known that she had returned south and was in the
neighbourhood of Madagascar. At the end of the third
week in September she came upon H.M.S. Pegasus off
Zanzibar. Pegasus was taken completely unawares while
she was cleaning furnaces and boilers and engaged in general
repairs. It was not possible then for her to make any
effective reply to Koenigsberg’s sudden assault, and a few
hours after Koenigsberg left she sank. Some time between
the end of September and the end of October,
Koenigsberg retreated up one of the mouths of the Rufigi
River, and was discovered near the entrance on October
31 by H.M.S. Chatham. From then onwards, all the
mouths of the river were blockaded and escape became
impossible. Her captain seemingly determined, in these
circumstances, to make the ship absolutely safe. He
took advantage of the high water tides, and forced his
vessel some twelve or more miles up the river. Here she
was located by aeroplane at the end of November. Various
efforts had been made to reach her by gunfire. It
was asserted at one time that H.M.S. Goliath had indeed
destroyed her by indirect bombardment. But there was
never any foundation for supposing the story to be true,
and if in the course of any of these efforts the ship suffered
any damage, it became abundantly clear, when she was
finally engaged by the monitors, either that her armament
had never been touched, or that all injuries had been made
good.
The problems which the existence of Koenigsberg propounded
were: first, Was it a matter of very urgent moment
to destroy her? Second, How could her destruction be
effected? The importance of destroying her was great.
There was, of course, no fear of her affecting the naval
position seriously if she should be able to escape; but that
she could do some, and possibly great, damage if at large,
the depredations of Emden in the neighbouring Indian
Ocean, and of Karlsruhe off Pernambuco, had proved very
amply indeed. If she was not destroyed then, a close
blockade would have to be rigidly maintained, and it was
a question whether the maintenance of the blockade would
not involve, in the end, just as much trouble as her destruction.
Then there was a further point. Sooner or
later, the forces of Great Britain and Belgium would certainly
have to undertake the conquest of German East
Africa. While Koenigsberg could not be used as a unit
for defence, her crew and armament might prove valuable
assets to the enemy. Finally, there was a question of
prestige. The Germans thought that they had made
their ship safe. If the thing was possible, it was our obvious
duty to prove that their confidence was misplaced.
If the ship was to be destroyed, what was to be the
method of her destruction? She could not be reached by
ship’s guns. For no normal warship of superior power
would be of less draught than Koenigsberg, and unless the
draught were very materially less, it would be quite impossible
to get within range, except by processes as slow
and laborious as those by which she had attained her anchorage.
Was it worth while attempting a cutting-out
expedition? It would not, of course, be on the lines of the
dashing and gallant adventures so brilliantly drawn for
us by Captain Marryat. The boats would proceed under
steam and would not be rowed; they would not sally out
to board the enemy and fight his crew hand to hand, but
to get near enough to start a torpedo at him, discharged
from dropping gear in a picket boat. To have attempted
this would have been to face a grave risk, for not
only might the several entrances be mined, but the boats
clearly would have to advance unprotected up a river
whose banks were covered with bush impenetrable to the
eye. The enemy, it was known, had not only considerable
military forces in the colony, but those well supplied with
field artillery. And there were on board Koenigsberg not
only the 4.1-inch guns of her main armament, but a considerable
battery of eight or perhaps twelve, 3-inch guns—a
weapon amply large enough to sink a ship’s picket boat,
and that with a single shot. An attack by boats then promised
no success at all, for the excellent reason that it
would be the simplest thing on earth for the enemy to
defeat it long before the expedition had reached the point
from which it could strike a blow at its prey.
There was then only one possible solution of the problem.
It was to employ armed vessels of sufficient gun-power
to do the work quickly, and of shallow enough
draught to get to a fighting range quickly. If the thing
were not done quickly, an attack from the masked banks
might be fatal. If the guns of such a vessel were corrected
by observers in aeroplanes, they might be enabled to do
the trick. Fortunately, at the very opening of the war,
the Admiralty had purchased from the builders three
river monitors, then under construction in England for the
Brazilian Government. They drew but a few feet. Their
free board was low, their centre structure afforded but a
small mark; the two 6-inch guns they carried fore and aft
were protected by steel shields. They had been employed
with marked success against the Germans in their first advance
to the coast of Belgium. When the enemy, having
established himself in the neighbourhood of Nieuport,
had time to bring up and emplace long-range guns of large
calibre, the further employment of these river monitors
on this, their first job, was no longer possible. For the
moment, then, they seemed to be out of work, and here
was an undertaking exactly suited to their capacity.
It was not the sort of undertaking for which they had
been designed. But it was one to which, undoubtedly
they could be adapted. Of the three monitors Mersey
and Severn were therefore sent out to Mafia Island, which
lies just off the Rufigi Delta and had been seized by us
early in the proceedings.
The first aeroplanes available proved to be unequal to
the task, because of the inadequacy of their lifting power.
The atmosphere in the tropics is of a totally different buoyancy
from that in colder latitudes, and a machine whose
engines enable it to mount quite easily to a height of
4,000 or 5,000 feet in Northern Europe, cannot, in Central
Africa, rise more than a few hundred feet from the ground.
New types of machines, therefore, had to be sent, and
these had to be tested and got ready for work. For many
weeks then, before the actual attack was undertaken,
we must picture to ourselves the Island of Mafia, hitherto
unoccupied and indeed untouched by Europeans, in the
process of conversion into an effective base for some highly
complicated combined operations of aircraft and sea force.
The virgin forest had to be cleared away and the ground
levelled for an aerodrome. The flying men had to study
and master machines of a type of which they had no previous
experience. The monitors had to have their guns tested
and their structural arrangement altered and strengthened
to fit them for their new undertaking. And indeed
preparing the monitors was a serious matter. The whole
delta of the Rufigi is covered with forest and thick bush—nowhere
are the trees less than sixty feet high, and in
places they rise to nearly three times this height. To
engage the Koenigsberg with any prospect of success, five,
six, or seven miles of one of the river branches would certainly
have to be traversed. There was, it is true, a
choice of three mouths by which these vessels might proceed.
But it would be almost certain that the different
mouths would be protected by artillery, machine guns,
and rifles, and highly probable that one or all of them
would be mined. The thick bush would make it impossible
for the monitors to engage any hidden opponents with
sufficient success to silence their fire. And obviously
any portion of the bank might conceal, not only field
guns and riflemen, but stations from which torpedoes
could be released against them. It was imperative therefore,
to protect the monitors from such gun fire as might be
encountered, and to take every step possible to preserve
their buoyancy if a mine or torpedo was encountered.
The Trent had come out as a mother ship to these two
unusual men-of-war, and from the moment of their
arrival, she became an active arsenal for the further arming
and protection of her charges. Many tons of plating
were laid over their vulnerable portions—the steering
gear, magazines, navigating bridges, etc., having to be
specially considered. The gun shields were increased in
size, and every precaution taken to protect the gunners
from rifle fire. Where plating could not be added, sandbags
were employed. By these means the danger of the
ship being incapacitated, or the crew being disabled by
what the enemy could do from the bank, was reduced
to a minimum. These precautions would not, of course,
have been a complete protection against continuous
hitting by the plunging fire of Koenigsberg’s artillery.
The more difficult job was to protect the ships against
mines and torpedoes. Their first and best protection, of
course, was their shallow draught. But it was not left
at that; and most ingenious devices were employed which
would have gone a fair way to keep the ships floating
even had an under-water mine been exploded beneath
the bottom. At intervals, between these spells of dockyard
work, the monitors were taken out for practice in
conjunction with the aeroplanes. Mafia Island, which
had already served as a dockyard and aerodrome, was
now once more to come in useful as a screen between the
monitors and the target. The various operations necessary
for indirect fire were carefully studied. Gun-layers,
of course, cannot aim at a mark they cannot see. The
gun, therefore, has to be trained and elevated on information
exteriorly obtained, and some object within view—at
exactly the same height above the water as the gun-layer—has
to be found on which he is to direct his sight.
The gun is now elevated to the approximate range, a
shot is fired and the direction of the shot and the distance
upon the sight are altered in accordance with the correction.
At last a point of aim for the gun-layer, and a sight
elevation and deflection are found, and his duty then
is to fire away, aiming perhaps at a twig or a leaf a few
hundred yards off, while the projectile he discharges
falls upon a target four, five, or even six miles off.
At last all was ready for the great attack. The crew
had all been put into khaki, every fitting had been cleared
out of the monitors; they had slipped off in the dark the
night before and were anchored when, at 3:30 in the
morning, all was ready. I will now let a participant
continue the story:
“I woke up hearing the chatter of the seedy boys and
the voice of the quartermaster telling someone it was
3:20. I hurried along to my cabin and was dressed in
three minutes; khaki shirt, trousers, shoes, and socks.
A servant brought me a cup of cocoa and some biscuits,
and I then gathered the waterbottle and a haversack of
sandwiches, biscuits, brandy flask, glass phial of morphia,
box of matches, cigarettes, and made my way up to the
top.
“It was quite dark in spite of the half moon partly
hidden by clouds, and men wandering about the docks
putting the last touches. It was impossible to recognize
any one as all were in khaki and cap and helmet. By
3:45 all were at general quarters and at —— we weighed
and proceeded. Both motor-boats were towing, one on
either side amidships. Two whalers anchored off Komo
Island, and burning a single light each, acted as a guide to
the mouth. We soon began to see the dim outline of the
shore on the right hand, and —— declared he could
distinguish the mouth. There were four of us in the top.
We arranged ourselves conveniently, —— and ——
taking a side each to look out. The Gunnery Lieutenant
took the fore 6-inch and starboard battery. I had the
after 6-inch and port battery. I dozed at first for about
ten minutes, but as the island neared woke up completely.
We had no idea what sort of reception we should have,
and speculated about it. It was quite cold looking over
the top. The land came nearer and nearer. We were going
slow, sounding all the way. On the starboard side it
was quite visible as the light grew stronger and stronger.
Suddenly when we were well inside the right bank we
heard a shot fired on the starboard quarter, but could
not see the flash. Then came another, but only at the
third did we see where it came from. It was a field-gun on
the right, but we had already passed it, and both it and
the pom-pom were turned on the Mersey astern of us.
“At least nothing fell near us. It was still not light
enough for us to judge the range, but as the alarm had
been given we opened fire with the 3-pounders, starboard
side, at the fieldgun. As we came up to the point on the
port side I trained all the port battery on the foremost
bearing, and opened fire as soon as the guns would bear.
We were now going pretty well full speed. Some snipers
were hidden in the trees and rushes, and let us have it as
we went past. The report of their rifles sounded quite
different from ours, but we were abreast before they
started, and were soon past. It was just getting light.
We were inside the river before the sun rose, and went
quite fast up. It was just about dead low water as we
entered, neap tide. The river was about 700 yards
broad. The banks were well defined by the green trees,
mangroves probably, which grew right down to the edges.
The land beyond was quite flat on the left, but about
four miles to the right rose to quite a good height—Pemba
Hills. Here and there were native huts well back
from the river; we could see them from the top though
they were invisible from the deck. On either side as we
passed up were creeks of all sorts and sizes at low tides,
more of them on the port side than on the starboard.
As we passed, or rather before, we turned the port or
starboard batteries on them and swept either side. The
gun-layers had orders to fire at anything that moved or
looked suspicious. We controlled them more or less, and
gave them the bearings of the creeks. —— was in charge
of those on deck, and the crews themselves fired or ceased
fire if they saw anything or had sunk anything. We
checked them from time to time as the next creek opened
up. We were looking ahead most of the time, but I
believe (from ——) we sank three dhows and a boat.
Whether they were harmless or not, I don’t know, but it
had to be done as a precaution. We made a fine noise,
the sharp report of the five 3-pounders and one 4.7 and
the crackle of the machine guns (four a side) must have
been heard for miles. The Hyacinth, the tugs, the Trent,
the Weymouth, and other odd craft were demonstrating
at the other mouths of the Rufigi, and we could hear the
deep boom of their 6-inch now and then. I believe, too,
that there was a demonstration by colliers, etc., off Dar-es-Salaam
at the same time.
“I had thought that the entry would be the worst part,
but it was not much. A few bullets got us and marked
the plates or went through the hammocks but no one was
hit, and as our noise completely drowned the report of
their rifles I doubt if many knew we were being sniped.
The forecastle hands knew all about it later on. As they
hauled in the anchor or let it go they nipped behind any
shelter there was, and could hear the bullets zip-zip into
the sandbags. The Mersey astern was blazing away into
the banks just as we were. There was probably nothing
in most of the creeks—but we did not know it then.
“It was 6:30 o’clock by the time we reached ‘our’
island, where the river branches into three, at the end of
which we were to anchor. We were steering straight up
the middle of the stream, and then swung slowly round to
port, dropped the stern anchor, let out seventy fathoms
of wire, dropped the main anchor, went astern, and then
tightened in both cables, so that we were anchored fast
bow and stern. As soon as we steadied down a bearing
was taken on the chart and the gun laid—about eight
minutes’ work. It was then found that, thanks to the
curious run of the current, the fore 6-inch would not bear,
and we had to take up the bow anchor and let it go again
to get us squarer towards the Koenigsberg.
“We could see the aeroplane right high up, and received
the signal ‘open fire.’ We were not quite ready, however.
From the moment when we turned to port to take up our
firing position to the time we were finally ready and had
laid both guns, occupied about twenty minutes. The
Koenigsberg started firing at us five minutes before we
were ready to start. Their first shot (from one gun only)
fell on the island, the next was on the edge of it, and very
soon she was straddling us. Where they were spotting
from I don’t know, but they must have been in a good
position, and their spotting was excellent. They never
lost our range. The firing started, and for the next two
hours both sides were hard at it. I don’t believe any ship
has been in a hotter place without being hit. Their
shooting was extraordinarily good. Their salvoes of fire
at first dropped 100 short, 50 over, 20 to the right—then
straddled us—then just short—then all round us, and so
on. We might have been hit fifty times—they could
not have fired better; but we were not hit at all, though
a piece of shell was picked up on the forecastle.
“The river was now a curious sight, as dead fish were
coming to the surface everywhere. It was the Koenigsberg’s
shells bursting in the water which did the damage,
and there were masses of them everywhere—mostly
small ones.
“We were firing all the time, of course. I attended
to the W/T, and passed the messages to the Gunnery
Lieutenant, who made the corrections and passed them
to the guns. —— watched the aeroplane and the banks
as far as possible. —— attended to the conning tower
voice pipe. We got H. T. fairly soon, and the Koenigsberg’s
salvoes were now only four guns. We heard the
boom; then before it had finished came whizz-z-z-z or
plop, plop, plop, plop, as the shells went just short or over.
They were firing much more rapidly than we, and I should
think more accurately, but if I had been in the Koenigsberg
I should, probably, have thought the opposite! All
this time the 3-pounders had occasional outbursts as they
saw, or thought they saw, something moving. Occasionally,
too, the smoke and fumes from our funnel
drifted across the top, and it was unpleasant for a minute
or two. We could see now where the Koenigsberg was,
and the smoke from her funnels, or that our shells made.
She was firing salvoes of four with great rapidity and
regularity, about three times a minute, and every one of
them close. Some made a splash in the water so near
that you could have reached the place with a boat-hook.
“At 7:40 (so I am told, as, though I tried I lost all
count of time) a shell hit the fore 6-inch of the Mersey
and a column of flame shot up. Four were killed and
four wounded. Part of the shield was blown away.
Only one man remained standing, and after swaying
about he fell dead. One had his head completely blown
off. Another was lying with his arm torn out at the
shoulder, and his body covered with yellow flames from
a lyddite charge which caught. The R. N. R. Lieutenant
in charge was knocked senseless and covered with blood,
but had only a scratch on the wrist to show for it. The
gun-layer had an extraordinary escape, and only lost
three fingers. Two men escaped as they had just gone
forward to weigh the anchor. A burning charge fell into
the shell room below, but was fortunately got out. Another
shell burst in the motor-boat alongside the Mersey
and sank it. One burst in the water about a foot from
the side, and we thought she was holed. The Mersey
captain then wisely moved and went down river, taking
up a position of 1,000 yards down, by the right bank
(looking at the Koenigsberg). She started in again with
her after gun, the other being disabled. For an hour
and twenty minutes we went on, and the Koenigsberg’s
salvoes came steadily and regularly back, as close as ever.
It seemed as if it could not go on much longer. We
registered four hits, and the salvoes were reduced from
four to three, and later to two, and then to one gun.
Whether we had reduced them to silence or whether the
Koenigsberg’s crew left them and saved ammunition it
is impossible to say.
“The aeroplane spotting had been fair, but now someone
else started in and made the signals unintelligible.
Then we got spotting corrections from two sources—both
differing widely. Finally, the aeroplane made “W. O.”
(going home). We weighed and took up station again
by the Mersey. She moved to get out of our way, and
when another aeroplane came we started it again. The
replies from the Koenigsberg were not so frequent, and
nothing like so accurate. It was as if they could not
spot the fall of shot. The aeroplane soon disappeared,
and as we could see the mast of the Koenigsberg (I could
only see one personally) and a column of smoke which
varied in thickness from time to time, we tried to spot
for ourselves. It was useless as, though we saw the burst
(or thought we did) in line with the masts, we did not
know whether they were over or short. Finally, we
moved up the river nearer, still keeping on the right side,
and set to work again.
“There were two cruisers—Weymouth and Pyramus,
I think—at the mouth. The Weymouth did a good deal
of firing at Pemba Hill and a native village close to us,
where there might be spotters.
“When we reached W/T corrections now they were
of no use. Most were ‘did not observe fall of shot,’ or
600 short. We went up 1,000, but still received the same
signal—whether from the aeroplane or the Koenigsberg,
I don’t know. It was most confusing. We crept up the
scale to maximum elevation. Finally, we moved up the
river again, but put our nose on the mud. We were soon
off, and moved over to the other side and continued firing,
spotting as well as we could (but getting nothing definite)
till four o’clock, when we packed up and prepared to
come out. We swept the banks again on both sides, but
only at the entrance was there opposition. We made
such a noise ourselves that we drowned the report of
any shots fired at us. Two field-guns made good practice
at us from the right bank (looking at the Koenigsberg).
One came very close indeed to the top—so much so that
we all turned to look at each other, thinking it must have
touched somewhere. One burst about five yards over
us. Another burst fifteen yards from the Mersey, and a
second hit her sounding boom. We could see the white
smoke of the discharge and fired lyddite, but the object
was invisible.
“It was getting dusk as we got outside at full speed.
The secure was sounded at about 4:45. We had been at
general quarters for thirteen hours, and eleven of them
had been under fire. Outside the other ships were waiting
for us near Komo Island, and we went straight alongside
the Trent. Each ship cheered us as we passed. The
Mersey put her wounded on the Trent, and then pushed
off to bury the dead.
“Tuesday, July 6, was the day of the first attempt, and
one of the worst I ever had or am likely to have. We
were at our stations from 3:45 A.M. till 4:45 P.M., and
eleven hours of that were under fire. The engine-room
people were not relieved the whole time, and they were
down there the whole time in a temperature of 132°-135°!
It was hot up in the top—but child’s play to the engine
room.”
On July 11 the second attack was made, but made in a
very different manner from the first. Once more let us
allow the same writer to complete the story:
“We went to General Quarters at 10:40 A.M. and were
inside the entrance by 11:40. How well we seemed to
know the place! I knew exactly where the beastly field
guns at the mouth would open fire and exactly when they
would cease—as we pushed in, and so if their shots went
over us they would land on the opposite bank among their
own troops. Very soon came the soft whistle of the shell,
then again and again—but we were nearing the entrance
and they turned on the Mersey. They hit her twice,
wounding two men and knocking down the after 6-inch
gun crew—none was hurt, however. I spotted a boat
straight ahead making across the river for dear life—they
may only have been natives, but we fired the 6-inch at
them till they leapt ashore and disappeared.
“Up the river we went. I knew each creek, and almost
each tree, and as before we blazed into them just before
we passed.
“We left the Mersey at the place where we anchored
last time in the hope that she would draw the Koenigsberg’s
fire and leave us a free hand. The Koenigsberg, however,
fired one salvo at her and then for the rest of the day concentrated
on us. She was plugging us for seventeen minutes
before we could return her fire. The salvoes of four
were dropping closer than ever if possible and afterwards
almost every man in the ship found a bit of German shell
on board as a souvenir. They were everywhere—in the
sandbags, on the decks, round the engine room—but not
a soul was even scratched!
“We went on higher up the river than last time and
finally anchored just at the top of ‘our’ old island. As
the after 6-inch gun’s crew were securing the stern anchor
two shells fell, one on either side, within three feet of the
side, and drenched the quarter-deck. It was a very critical
time. If she hit us we were probably finished, and
she came as near as possible without actually touching.
I had bet 5s. that she would start with salvoes of four guns,
and I won my bet. They did not last long, however, once
we opened fire. It was a near thing, and had to end
pretty quickly one way or the other. We had received
orders that she must be destroyed, and the captain, the
night before, had told all hands assembled on the quarter-deck
that we had to do it. We intended to go up nearer
and nearer, and if necessary sight her. Of course we
could not have gone through it—but there is no doubt
that on the 11th it was either the monitors or the Koenigsberg.
“We had no sooner anchored and laid the guns (the
chart proved to be one mile out in the distance from us
to the Koenigsberg!) than the aeroplane signalled she was
ready to spot. Our first four salvoes, at about one minute
interval, were all signalled as ‘Did not observe fall of
shot.’ We came down 400, then another 400 and more
to the left. The next was spotted as 200 yards over and
about 200 to the right. The next 150 short and 100 to
the left. The necessary orders were sent to the guns, and
at the seventh salvo we hit with one and were just over
with the other. We hit eight times in the next twelve
shots! It was frightfully exciting. The Koenigsberg was
now firing salvoes of three only. The aeroplane signalled
all hits were forward, so we came a little left to get her
amidships. The machine suddenly signalled ‘Am hit:
coming down; send a boat.’ And there she was about
half way between us and the Koenigsberg planing down.
As they fell they continued to signal our shots, for we, of
course, kept firing. The aeroplane fell into the water
about 150 yards from the Mersey and turned a somersault;
one man was thrown clear, but the other had a struggle
to get free. Finally both got away and were swimming
for ten minutes before the Mersey’s motor-boat reached
them—beating ours by a short head. They were uninjured
and as merry as crickets!
“We kept on firing steadily the whole time, as we knew
we were hitting—about one salvo a minute. The Koenigsberg
was now firing two guns; it is hard to be certain, as
there was much to do and a good noise going on. Still,
within seventeen minutes of our opening fire I noticed
and logged it down that she was firing two. She may have
been reduced to that before, but she never fired more after.
“In a very short time there was a big explosion from
the direction of the Koenigsberg, and from then on she was
never free from smoke—sometimes more, sometimes less;
at one moment belching out clouds of black smoke, then
yellow, with dull explosions from time to time. We kept
on firing regularly ourselves, one salvo to the minute—or
perhaps two salvoes in three minutes, but the gun-layers
were told to keep cool and make sure of their aim. There
was one enormous explosion which shot up twice as high
as the Koenigsberg’s masts, and the resulting smoke was
visible from our deck. The men sent up a huge cheer.
“For some time now we had had no reply from the
Koenigsberg. At 12:53 I fancy she fired one gun, but I
was not certain. She certainly did not fire afterwards.
As our guns were getting hot we increased the range from
9,550 to 9,575, and later to 9,625—as when hot the shots
are apt to fall short. Fine columns of smoke, black,
white, and yellow, and occasional dull reports rewarded
us, but we were making no mistake and kept at it. The
aeroplane was not available, and we had no one to spot
for us, remember; still we could see the K.’s masts from
our foretop, and the smoke, etc., told its own tale.
“Another aeroplane turned up, and we now signalled
the Mersey to pass on up stream and open fire nearer.
She gave us a great cheer as she passed.
“We raised our topmast and had a look at the Koenigsberg.
She was a fine sight. One mast was leaning over
and the other was broken at the maintop, and smoke was
pouring out of the mast as out of a chimney. The funnels
were gone, and she was a mass of smoke and flame from
end to end. We had done all the firing which had destroyed
her. The Mersey only started afterwards. That
was part of the plan. Only one ship was to fire at a time,
and then there could be no possible confusion in the spotting
corrections; it was a lesson we learned on the Tuesday
before! We started. The Mersey was then to move up
past her and fire for an hour and so on. Fortunately it
was not necessary, and as it turned out would have been
impossible. If we had gone on we should probably be
there now! When the Mersey passed us she struck a bar
about 1,000 yards higher up, and after trying to cross in
two different places 100 yards apart, anchored for firing.
There was only eight feet of water on the bar and the tide
was falling. If we had got up we should probably have
had to wait twelve hours for high tide, and probably the
Germans would have annoyed us from the banks!
“The Mersey fired about twenty salvoes and made
several hits, and as the aeroplane had signalled ‘O. K.’
(target destroyed) we prepared to leave the river. Before
we went the Gunnery Lieutenant and myself went to the
top of the mast to get a better view, and I took a photo
of the smoke, resting the camera on the very top of the
topmast! The Captain came up too, and there were the
three of us clinging to the lightning conductor with one
arm, glasses in the other, and our feet on the empty oil
drum we had fixed up there as a crow’s-nest.
“Just as we were starting back we saw some telegraph
poles crossing a creek behind us. It was undoubtedly
the communication used by the German spotters. We
let fly with everything and smashed them up. A pole is
not an easy thing to hit, and I expect the destruction of
those two cost the Government about £300 in ammunition.
“All the way down we swept the banks and made up
our minds to knock out the field guns at the mouth if we
possibly could. We tried our best, but I don’t think we
touched them. They fired on us till we were out of range.
They did not hit—but I saw one fragment about six inches
by one inch picked up on the boat deck.
“Two tugs were waiting over the bar, and after giving
us a cheer took us on tow to help us back to Trent. The
Weymouth, with the Admiral on board, came round and
then passed us at speed; all hands lined the ship and, led
by the small white figure of the Admiral on the bridge,
gave us three splendid cheers. It was one of the finest
sights I have ever seen. We answered back—and what
a difference there was to our cheers of Tuesday last. We
made about three times the noise....
“I went to the Captain’s cabin for half an hour to copy
out the notes I had taken. From the very first shot we
fired I kept a record of every shot fired by the 6-inch guns,
and all I could see or hear round about, writing something
every minute, i.e. 12:37 2 guns. H.T. J.M. 12:38
2 guns. H.T. 12:38½ (Koenigsberg firing 2). Column of
smoke; aeroplane hit and coming down, etc.
“I ought to explain that ‘J.M.,’ ‘B.F.,’ ‘F.20,’
‘G.15,’ ‘H.T.,’ and so on are signals from the aeroplanes.
‘H.T.’ means ‘a hit.’ In order to make sure
of the right letters having passed the man shouts not
‘H.T.’ alone, ‘H. for Harry, T for Tommy,’ and then
there can be no confusion. The man at the voice pipe
in the conning tower simply roared out ‘H. for Harry,
T. for Tommy,’ each time it was signalled. Well, when
I was making my copy in his cabin on the way back, the
Captain came in for a moment. He leaned his hand
quietly on my shoulder and with a huge sigh said, ‘If
ever I live to have a son, his name shall be Harry Tommy!’
I firmly believe he meant it too, at the time!”
If the people in Severn and Mersey had had a narrow
squeak for it, not once but a dozen times, from Koenigsberg’s
salvoes, the spotting party in the aeroplane must
have had just as exciting a time. And, as we have seen
from the foregoing account, with them Koenigsberg was
more fortunate. On July 11th everything was against
Lieutenant Cull, the first pilot to go up, and Flight-Sub-Lieutenant
Arnold, who was acting as observer. To begin
with it was a cloudy day, and the machine had to be kept
dangerously low if the observer was to do his work. The
aeroplane got over the target at about 12:20, while Mersey
was firing hard. But this fire of the Mersey had nothing
to do with the organized effort to destroy the enemy. It
was merely a blind—an effort to get the enemy’s observer
on land to deflect the fire on that ship on to Mersey, while
Severn got ready for the real work. The aeroplane, therefore,
paid no attention to Mersey’s fire and telegraphed
no observations. Ten minutes later Severn opened fire
and Mersey ceased. Mersey’s diversion did for a time
bring Koenigsberg’s guns in her direction. But no sooner
did Severn open fire than she got the full benefit of Koenigsberg’s
salvoes of four, which followed each other at intervals
of about a minute. Five minutes after Severn
opened at 12:30, Koenigsberg’s salvoes began to straddle
her. Nine minutes after Severn opened fire the aeroplane
signalled first hit. And less than ten minutes after that
Lieutenant Arnold telegraphed ‘We are hit; send boat.’
In point of fact, it is probable that the aeroplane’s engine
had been slightly injured earlier. For, dangerously low
as the machine had to fly at the beginning, it was found
impossible to keep even at that height, and as it got lower
and slower, it obviously became an easier mark for the
Koenigsberg’s 12-pounders. At 12:46 a terrific bump was
felt in the machine, and shortly afterwards the engine
broke up with a rattle and a crash, and there was nothing
for it but to start sliding down. Imagine the situation!
The machine, between 3,000 and 4,000 feet in the air,
nearly three miles from the monitors; the only possible
hope of safety to make this long glide and then to land—if
the bull may be permitted—in a narrow strip of river
bordered by impenetrable bush—the bush dotted with
lofty trees! If the machine missed the river and hit the
trees, it was certain death wherever it landed. If it missed
the trees and hit the river, there was palpably no safety
unless it was within a very short distance of the monitors.
For nowhere else did the pilot and observer stand the
faintest chance of rescue. A situation more absolutely
desperate could hardly be imagined.
It was certainly not one in which the seemingly doomed
occupants could have been blamed if they had thought
of their safety and of nothing else. But while the pilot
was, quite properly, concentrating his attention on performing
as nice a feat in flying as can be imagined, Flight-Lieutenant
Arnold, content to leave this matter in the
skilled hands of his comrade, continued imperturbably to
carry on his duties.
Severn, having got the range, naturally continued firing.
Flight-Lieutenant Arnold, having been sent up to observe,
continued observing, and each shot that he observed, on
what must have seemed his last glide to certain death,
was signalled to the control parties on board the monitor.
The gist of this was that six out of ten shots were hitting,
and apparently were hitting steadily, but all were striking
Koenigsberg in the bows. Arnold’s last achievement as
an observer was to deflect this fire amidships and to the
stern. And he had hardly succeeded before the ‘plane
crashed into the water 500 yards from the Mersey. Mersey
had her motor-boat ready and it was sent full speed to
the rescue. Arnold had no difficulty in getting himself
free, but Lieutenant Cull was not so fortunate. In the
excitement of his task he had forgotten to loosen the straps
that held his belt and feet, and was fairly under water
before he realized his predicament. How he wrenched
himself free of these impediments is somewhat difficult
to understand, and it is not surprising that his apparel
suffered somewhat severely from his efforts. When he
came to the surface he found Arnold scrambling about the
wrecked machine in search of him, and both were got
safely into the boat. The machine, smashed and waterlogged
in the river, was of course past saving, and there
was nothing for it but to demolish it. Take it all in
all, few prettier pieces of work in the air—whether we
look at the flight craftsmanship of the thing, or the practical
use that the last moments of flight were put to—have
yet been recorded.
There are several features in these operations that are
of great interest. To begin with, the destruction of a
ship by the indirect fire of another ship had not, so far as
I know, been systematically attempted before. There
was indeed a story of Queen Elizabeth having sunk a
Turkish transport by a shot fired clean over the Gallipoli
peninsula. In the case of the Queen Elizabeth’s victim
the target was not only incredibly far off but actually
under way. But this must be regarded as amongst the
flukes of war, if indeed that may be called a fluke when the
right measure had been taken to ensure success. Still,
it was more probable that the attempt might be made a
hundred times without a hit being made than that the first
shot fired should have landed straight on the target. But
here on the Rufigi the monitors had gone up after making
ample preparations and after full practice, to achieve a
particular object. It was to destroy a very small ship at
a range which, for the gun employed, must be considered
extraordinarily great. Ten thousand yards is relatively
a longer range for a 6-inch gun than is, say, 18,000 for a
15-inch. But while in this respect the task proposed was
extraordinarily difficult, there was one element present
that would distinguish it from almost any other known
use of naval guns. In engaging land forts, both on the
Belgian coast and off Gallipoli, there had been ample
experience with a stationary target engaged by a stationary
ship. But here the firing ship was not only stationary
in the sense that it was moored, but was practically at
rest in that it was lying in smooth water with no roll or
pitch to render the gun-layers’ aim uncertain. The current
did cause a certain veering, but not a sufficient movement
to embarrass laying. But if in this respect the conditions
were easy, they were extraordinarily difficult in every
other. The monitors, for instance, were as much exposed
to Koenigsberg’s fire as was Koenigsberg to that of the
monitors, and whereas Koenigsberg’s guns could be spotted
from a position on shore the monitors’ fire had to be
spotted by aeroplane. The whole of the operations of
Severn and Mersey then were not only carried out under
fire, but under an attack that on the second day as well
as the first was extraordinarily persistent and extraordinarily
accurate. That in the course of two days only
one of our ships was hit, and that one only once, must be
considered a curiosity, for so good were the gunnery
arrangements of Koenigsberg that each monitor when
under fire was straddled again and again by salvoes, and
when not straddled had the 4.2 shells falling in bunches
either just short or just over them. The explanation of
her having failed to get more hits than she did, while
ultimately Severn’s was completely effective, does not lie
in any inferiority of skill, but almost entirely in the fact
that the range, if exceptionally great for a 6-inch gun,
was almost fabulous for a 4.2, and next that Koenigsberg
was a much larger target than either Severn or Mersey.
Koenigsberg was probably aground, and therefore showing
from three to four feet more of her side than she would at
sea. Monitors are a craft with a very, very low freeboard,
with a comparatively small central house built
up amidships. As a point-blank target Koenigsberg
would probably be more than twice the superficial area
that either Mersey or Severn would present. The contrast
between them as virtual targets, that is, the target that
would be presented to the shell as it descended from a
height upon the ship, would not, of course, be so great,
because the monitors were each of them wider than the
German cruiser, but even as a virtual target the Koenigsberg
was much more favourable for the British guns.
But the master difficulty of the situation was for the
men on the spot, without previous experience of indirect
fire, and unaided apparently by any advice from headquarters
as to the result of service experiments elsewhere,
to extemporize all the processes for finding and keeping
the range of a target invisible from the ship. The two
essential elements in these processes were (1) for the
observer in the aeroplane to note where each shot fell,
and (2) to inform the ship that fired it exactly what the
position of the impact was, whether to the right or to the
left, over or short, and an approximate measurement in
yards of its distance from the target. No one of those
concerned had ever engaged in any similar operation.
The aviators had not only never carried observers to spot
naval gunfire, they had none of them ever even flown in
the tropics, where the conditions of flight differ altogether
from those in more temperate zones. The observers were
even more new to the work than the aviators. Apparently
some of them had never been in flying machines before.
They not only had to learn the elements of spotting, they
had to become familiar with the means of sending communications.
There seems at one time to have been
considerable doubt as to the best means to employ for
communication. The means would have to include not
only a system of sending messages, whether by wireless,
by lights flashing a Morse code or otherwise, but the
production of a code as well. When these points were
settled, the preliminary practices of Mafia Island gave
what appeared to be sufficient experience to show that
right principles were being followed. Only when this
practice had given satisfactory results was the first
attempt of July 6th made.
In the course of that day’s firing the observers reported
eight possible hits during the first phase of the firing, and
none afterwards. Once or twice smoke was seen to issue
from Koenigsberg and in the course of the day the number
of guns in her salvo fell from five to three, and ultimately
she was employing only a single gun. The monitors had
fired approximately 500 rounds to obtain these hits, and
had probably double this number fired at them. Opinions
differed as to the result, but that some thought Koenigsberg
had finally been destroyed is apparent from the
character of the Rear-Admiral’s message to the Admiralty.
Reflection, however, appears to have made it clear that
Koenigsberg was very far indeed from being really out of
action, and it became necessary to inquire why there
should have been any uncertainty in the matter. The
crux of the position was this. Fire had opened at seven
in the morning and continued till nearly half-past four
in the afternoon. But when the character of the messages
transmitted by the observers came under critical examination,
it seemed almost certain that no hits were made at
all after the first hour. Every kind of explanation for so
indecisive and disappointing a result was examined. It
was disappointing because it had been shown that it was
quite practical to make hits, and it seemed as if there
must be something wrong if the hitting could not be
continued. Every possible cause of breakdown was put
under examination. Had there been anything wrong
with the wireless transmitters in the aeroplanes? Had
the receiving gear in the monitors broken down? Were
the observers too inexperienced, hasty, or unreliable?
Had the guns become worn or too hot? Were the sights
at fault? But when it came to the point each of these
criticisms broke down. There was no reason to distrust
the observers, and as all the ships in the offing had received
the messages, the transmitting gear must have
been above suspicion. Then the monitors’ records tallied
with the ships’ records, so that there was nothing wrong
with the receivers. When the observers themselves were
put through their paces, it seemed that over an area of at
least half a mile, say 600 yards short of the target and 200
over, there was really no possibility of making mistakes
about where the shots fell, for in this area it was all either
open water or dry sand. But outside of this comparatively
narrow area there was thick bush, and to an observer
at the height of between 3,000 and 4,000 feet even a bursting
shell falling in a forest whose trees ran from between
70 to 150 feet high, affords a very uncertain mark. And
after 8 P.M. it seemed that only very few shells fell in the
belt where their impact was visible, and that sometimes,
for very considerable periods, every shot seemed to go into
the forest. Could the guns have suddenly become
absolutely unreliable? But tests were made, and the
guns proved to be quite as accurate as they were before
the firing began, and indeed the exactitude of the results
precluded this form of error from explaining the failure
to complete the business.
At last, when the firing times of the two ships were
compared with the observers’ records of the pitching of
the shell, the true explanation leapt into sight. The
whole show had broken down over the old difficulty of
the identification of shots. The people in the aeroplanes
could not tell whether a particular shot had been fired by
Mersey or Severn, and as both ships got the message,
neither could tell whose shot had been observed. It
followed therefore that the consequent correction was
often put on to the wrong gun. Thus, for example,
suppose Mersey had fired a shot 300 yards over the target
that fell in bush and was invisible to the observers, while
Severn had fired one that was 200 yards short and visible.
The observers would wireless 200 short, whereupon the
Mersey would think that this message was intended for
her, and raise her sight by this amount. Her next round,
of course, would go still farther into the bush, and suppose
this was visible or partially visible to the observer, who
might perhaps have missed Severn’s next round, he might
telegraph back 500 or 600 over, a correction that Severn
might take to herself, and lose her next shot in the bush
short of the target. The men on the Rufigi in short
discovered for themselves, by their experiences on this
first arduous day against the Koenigsberg, that the problem
of correcting the fire of two separated batteries by the work
of a single observer is so exceedingly difficult of solution
as to make it hardly worth attempting. The lessons so
painfully brought home were put to immediate and
most successful use. It was resolved on the second
attempt that only one monitor should fire at a time. This
was not of course the only experience of value obtained
in the first day’s operation for when all the results were
collated and compared, a pretty exact knowledge of the
actual range from the chosen anchorage to the target was
obtained, so that on the second day there were fewer
initial rounds lost before shell began to fall in the immediate
surroundings of the enemy, where the position of each
could be verified. When all ambiguity as to the meaning
of corrections was removed, the process of finding
the target and keeping the range became exceedingly
simple.
As will be seen from the narrative, the serious work of
the second day began when Severn opened fire about half-past
twelve. Nine minutes later, after quite deliberate
fire, she obtained her first hit, and from then on continued
hitting with great regularity. But before she had been
firing ten minutes the spotting aeroplane was disabled
and came down. Though the Koenigsberg herself was
invisible, the columns of lyddite fumes and smoke sent
up by the hits could be seen over the trees, and such
columns indicated that hits were being made very frequently.
Within a quarter of an hour of the first hit,
Koenigsberg ceased her return fire, and shortly after this
a huge volume of smoke of a totally different colour from
that sent up by lyddite indicated that there had been a
great explosion in the ship. When the second aeroplane
came out to resume the work of spotting, Mersey took up
the work of firing in Severn’s place. Severn had ceased
fire at 1:35 and Mersey opened at a quarter past two. But
it soon became clear that it was unnecessary for her to
proceed with the work, and that with the explosion at
1:15 the business of the Koenigsberg was finished.
What two ships firing continuously for eight hours on
July 6th had failed to achieve, a single ship had accomplished
in probably fifteen minutes. It was the most
perfect exemplification imaginable of the difference in
results that wrong and right systems of gunnery produce.
The skill shown on the second day was no better than on
the first. It was a change of method that made the
difference.
What is of special interest is this. Up to the year 1909
it appeared quite premature to discuss methods of concentrating
the fire of several ships on a single distant
target, until right methods had been discovered for
making sure of hitting it with the guns of a single ship.
But by the winter of 1909 there seemed to be sufficient
experience to show that a complete solution of the simpler
problem was assured, and that the time had come for
considering how two or more ships could combine their
armament. The difficulty of the matter was soon made
obvious. While great guns do not all shoot exactly alike,
it is possible to ascertain by experiment the individual
differences of all the guns in a single ship, and to vary
the sight scales so that, at all critical ranges, they should
give identical results. But what can be done for a single
battery of eight or ten guns cannot be done by experiment
for two units of such batteries. If then two ships are to
be employed at the same target, it was the very essence
of the matter if two processes were carried on simultaneously
to obtain one result, that each process should be so
organized as to run as if the other were not going at all.
Now ships’ guns at sea can be corrected only from positions
high up in the masts. It therefore became clear
that if the firing ship allowed a fixed interval, say three or
four seconds, to elapse after a sister ship had fired, before
sending her own salvo at the enemy, it would be quite
easy, by keeping a record of the time of flight of the projectiles,
to pick out her own amongst the salvoes falling
in rapid succession on the target, so that there should be
no possibility of her mixing up her own shells with her
neighbours’. It is now many years since it was suggested
that gongs driven by a clockwork device, which could be
set to the time of flight, would simplify this method of
identification. Suppose the time of flight to be twelve
seconds, the gong would be set to this interval and the
clockwork started into motion simultaneously with the
firing of the salvo. The observers watch the target and
pay no attention to any shots that fall, except those whose
incidence coincided with the ringing of the gong.
The essence of this system was the ear-marking, so to
speak, of each separate salvo as it went away. But it
was manifestly not a principle on which observers placed
at a distance from a ship could work. If they were to do
their work they must employ some totally different means
of identification. Else indirect firing could only be carried
on by one ship at a time.
My correspondence in 1909 and 1910 shows that these
principles were fully grasped by many gunnery officers in
the navy in these years. And I must confess I was extremely
astonished when our proceedings at the Dardanelles
in March and February and April showed that there
was no common practice in the matter throughout the
navy. At last, in the month of May 1915, I set out these
elementary principia of indirect firing in Land and Water.
“The difficulty in correcting the fire of a multitude of
ships is, it may be added, twofold, because each salvo
must be identified as coming from a particular ship, and
then that ship be informed of the correction. There is
apparently no escape from the necessity of having a separate
spotter for each ship. If the spotter is in an independent
position, the obstacles in the way of this double task
are considerable. And aeroplanes are not a satisfactory
substitute. At best an aeroplane can help one ship only.”
It will be observed that in July the officers at the Rufigi
had to work them all out again for themselves!
Nothing could better illustrate the curious individualism
which governs the organization of our sea forces. Each
ship, each squadron, each fleet seems to come to the study
of these things as if they were virgin problems, entirely
unaided by advice or information from the central authorities,
so that there is not only no uniformity of practice—in
itself a not unmitigated evil—but what is really serious,
a total absence of uniformity of knowledge. I am the
last person in the world to suggest that all naval affairs
should be regulated in every petty detail from Whitehall.
There are quite enough forces at work to repress freedom
of thought or restrict liberty to investigate and experiment
in the fullest possible way. But there is surely the widest
possible difference between a restraining tyranny and an
intelligent system of communicating proved principles
and the results of successful practice.