Kitabı oku: «The Story of Our Submarines», sayfa 3
II
ANTI-SUBMARINE WORK
I
Before speaking of anti-submarine work, a very short description of the German submarine and its variations in type is advisable.
A U-boat is not unlike our ordinary patrol-type submarine. She varies in size and capabilities, but is generally a 16-knot (surface speed) boat, with two guns – a 4·1-inch and a 22-pdr., two bow and two stern torpedo-tubes, and about 800 tons surface displacement.
A U-B boat is a small patrol boat of about 500 tons surface displacement; one 4·1-inch or 22-pdr. gun, one stern and four bow torpedo-tubes, 13 knots surface speed. There is also a "Flanders," type U-B class, of 250 tons and 8½ knots speed. The latter class worked from Ostend and Zeebrugge.
A U-C boat is about 400 tons; one 22-pdr. gun, 12 knots speed, one stern and two bow torpedo-tubes. The Flanders type U-C's are of 180 tons and 7½ knots speed. All U-C's are primarily fitted for mine-laying.
The U cruisers are from 2000 to 3000 tons displacement, carry two 5·9-inch guns, have a speed of 16 knots, and in some cases are fitted as mine-layers in addition to their torpedo equipment.
The number of slight divergencies from the main types is considerable. Boats were built in standardised groups, and, during the second half of the war, in great quantities. On November 11th, 1918, the position was, roughly, as follows: 200 submarines in German hands, commissioned or completing – 135 (roughly) on the building slips. About 200 had been destroyed up to that date.
In 1918 the average number of German submarines at sea – in the Adriatic, Irish Sea, Channel, and North Sea – was (in the spring) 20, in October, 24. The number available for service – excluding Mediterranean boats, school boats, and boats out of date – was about 72; so that, roughly, one-third were kept at sea, and the remainder resting or repairing.
The medium-size German submarines are quite good-looking boats, but the German mind showed itself clearly in the U cruisers. It has been an axiom at sea since the days of the Vikings, that a thing that looks ugly isn't good seamanship. British submarines are better stream-lined than German boats, and have generally a more "varminty" and clean-run look. The sight of a U cruiser in dry dock recalls to one's mind a pair of pictures once published in 'La Vie Parisienne' – a Paris weekly which has done as much to win the war as any other periodical. The first picture showed a "seventy-five" gun, and standing beside it a girl built on clearly thoroughbred lines, balancing a cartridge on her hand. The second was of a squat 11-inch howitzer, accompanied by 'La Vie's' interpretation of a homely German Frau clutching the great shell to her portly figure. The two pictures illustrate rather well the ideas of our own K-boat designers as compared with the mental state of the authors of the German submarine cruisers.
II
It used to be a catchword of naval correspondents that "submarine cannot fight submarine." Well, it is true, and it isn't. What can be done is that one submarine submerged can torpedo another submarine on the surface: in which case submarine No. 2 is not really a submarine at the moment. Two submarines may meet and have a gun-action, with possible damage to one or both of them, and much entertainment to their crews; but in such a case neither boat would be acting as a submarine.
Throughout the war our boats have been on the look-out for, and ready to engage, any enemy submarines met with. We have had boats, in varying numbers, since the middle of 1915 engaged definitely in submarine-hunting – that is, those boats that could be spared from the all-important task of watching the Bight and its approaches. The anti-submarine boats we sent out simply proceeded to areas where, by inference or by "information received," U-boats might be expected to be working. The ordinary patrol boats on passage to and from their stations, or while watching at their stations for the coming of big ships, often met with U-boats, and naturally took the chances the gods gave them with gun, torpedo, stem, or whatever means seemed best at the moment.
Of course, the torpedo was the usual weapon used. A hit on a big ship, once the destroyer screen has been avoided, is comparatively easy; a hit on a U-boat is mighty difficult. The attacker is looking at his target with his eye (the top prism of the periscope) only a few inches above water-level. His view of the enemy, therefore, is confined to a square-looking conning-tower, with heavy "jumping wires" (sweep deflectors) running down from it to a low grey line of hull. It is therefore difficult to exactly estimate the enemy's speed or course, and the short time at the attacker's disposal for deciding on his deflection and turning to bring his tubes to bear does not allow of an accurate calculation based on bearings of the passing target. In fact, it is usually a case of "make up your mind and shoot quick." In addition to the handicap of the target being small, there is the knowledge that one must be far more careful to show only a little of the periscope during the attack, as submarines are far more on the qui vive for periscopes than big ships are. For one thing, they know what a periscope looks like; and for another, they have more knowledge of what a torpedo can do against craft of small buoyancy.
The moral effect of the use of submarine against submarine was probably greater than the direct effect. It discouraged U-boats from coming to the surface to use their guns against merchant ships, and restricted them to their torpedo armament, which was of course limited. A U-boat on the surface had the same sensations as a man would have who fell overboard crossing the Indian Ocean, where the sharks are always keeping station astern of a ship: a feeling of impatience, and anxiety to get back to where he came from. As an instance, I will mention the case of U 81, who, while engaged in the congenial work of pumping shells into an English merchant ship, received two torpedoes amidships from "E 54," who had been following operations through her periscope since U 81 first rose to the surface. "E 54" picked up seven survivors, one of whom was the Captain. The latter officer was somewhat damaged by the explosions, and was in danger of drowning until "E 54's" First Lieutenant dived for him and brought him aboard. Another survivor was the Warrant Officer, who, on being taken below, sent a message by "E 54's" coxswain to Commander Raikes, to the effect that it was advisable to keep a good look-out and to submerge again soon, as there was another U-boat diving near at hand. Commander Raikes would no doubt have acted on the second part of this excellent advice had it not been necessary for him to assist the damaged steamer into harbour. If one once begins to quote cases, it is difficult to keep from irrelevance, but I must note here that at the moment of the sinking of U 81, the crew of the steamer had very wisely abandoned ship, and the change from a U-boat in full view to a ditto E boat took place so suddenly that there was a natural misunderstanding when "E 54" stood over to tow the boats back to their ship. The steamer's crew were living too fast in twenty minutes for the situation to be quite clear, and in view of their knowledge of the way in which certain U-boats had dealt with survivors, the fact that "E 54" had to actually chase the lifeboats is comprehensible.
The following is from reports of captured U-boat's men: —
"Several prisoners give clear evidence of the fear inspired by the possible presence of Allied submarines submerged when they themselves were on the surface. Besides the probable results of this method of attack, the apprehension of it constitutes a seriously demoralising influence."
From an officer: —
"We knew that for every boat we had working in an area, you had two looking for us."
The latter statement shows an error in the officer's calculations. The odds were very much the other way; but his error shows that moral effect goes for a good deal in war.
In actions between submarines, guns have also been used, as have rifles, pistols, and – at short range in the dark – verbal abuse; but no definite sinkings on either side can be traced to these causes. In our boats it was the rule to attack submerged, if possible – in the U-boats it was rare to find an inclination to pursue a gun-action to its logical end. A submarine, when nearly hit, can refuse action at any time by diving. This, of course, forces the opponent left on the surface to dive also, as it would be unhealthy then to remain on the surface in that locality. Our submarines were always more lightly gunned than the U-boats. Few of them carried more than one small gun – and that one usually an anti-aircraft weapon. This was for two reasons. Firstly, our boats are meant for warship-destroying as opposed to commerce-destroying. The attacking of warships implies speed under water (one should have, roughly, at least half the speed of the class of ship one is after). Big guns are bad for stream-line, and therefore militate against high submerged speed. Secondly, we were supplying guns to Allies, our own Army, and to all our merchant ships and "mystery ships," and the submarines had to take their turn at the supply with the rest.
The British officer always had an inclination to use the ram if he got a chance. A submarine can ram almost anything, and still, as the U.S. Navy puts it, "Get away with it." Our boats have a ten-inch razor-edged cast-steel stem fitted to them for net-cutting and other purposes. They can also, by their system of compartments, stand damage forward to the extent of a crushed bow, as far back as the bow hydroplanes, with no great risk to themselves. Add to these things the delightful idea of being able to thoroughly damage your ship and to be praised instead of court-martialed for the action, and it is obvious that a number of attempts along this line have been made. There is no record of one having been successful to the extent of sinking an enemy, but in some cases U-boats were damaged in this way. A curious case of accidental ramming was that in which "E 50" (Lieutenant-Commander Michell), when diving near the N. Hinder Light-vessel, sighted a periscope close aboard on the bow. A moment later the two boats collided heavily at 25 feet by gauge. "E 50's" Captain, deciding that the other boat was underneath him, put his hydroplanes "hard-to-dive," and flooded tanks with the idea of carrying the enemy to the bottom (at that point 180 feet away) and crushing him. The U-boat, however, broke away, and after showing her stern and conning-tower a moment on the surface, sank again. It was later discovered that the enemy got home damaged. "E 50" came out of the affair with the loss of her port-bow hydroplane and a few dents. On such an occasion, there is no time to inspect your own boat for damage before making up your mind if you should or should not instantly rise to the surface. It is a natural action to bring your own boat up as soon as possible, in case the chance of ever getting her up at all goes by. The Captain of "E 50" acted on the rule that a dead U-boat is a primary consideration, whatever one's natural inclinations may be; his crew, though not consulted, were in full agreement with him.
Again, I must quote an irrelevant incident. There were two of our submarines in the Heligoland Bight patrol, diving in adjacent areas. They both returned to harbour slightly damaged – one under the impression that, while diving at 55 feet, he had been run over by a surface vessel; the other reporting that, while diving at 25 feet, he had bumped over a submarine. On meeting in harbour they found the times of the mysterious collisions tallied to the minute.
In April 1915, the idea of using a fishing trawler as a decoy originated in the Vulcan's flotilla (C-class submarines) – based on Leith. The U-boats had been sinking our fishing-boats at their leisure, and it was clear that if a few U-boats were mysteriously lost on this duty, it would be a discouraging thought for the remainder. It must be remembered that a "missing" boat has a certain moral effect – a boat openly sunk by gun fire, etc., serves only as an example for others to be more careful. If a certain duty or a certain area becomes unhealthy for U-boats without any explanation, it tends to make the enemy chary of sending boats out on similar work, until the matter is cleared up. Hence the secretiveness of the Admiralty during the war on the losses of enemy submarines. Prisoners taken from U-boats were prevented from explaining to anybody how their boats were sunk. It may have been from humanity, or it may have been from the consideration that U-boat prisoners were usually communicative in a useful way, but orders were strict that as many prisoners as possible were to be saved from the water when U-boats were sunk.
The Vulcan's idea was of masterly simplicity. The U-boats found a fishing fleet easy prey; therefore a fishing fleet with a "catch" on it would get results. One trawler of each fleet was to tow, instead of a trawl, a C-class submarine. The submarine would keep well submerged at the end of the hawser, and need not necessarily keep a periscope look-out, in view of the fact that the critical moment for her to slip tow (a tow can be slipped while submerged) would be notified to her by telephone from the trawler's bridge. Submarine "C 24" was the first to show that the theory worked out in practice.
It will be seen, however, that she did the work under a considerable handicap, and had the most aggravating experience a submarine can have – that of doing an attack with "something wrong with the works."
Lieutenant Taylor, in command, reported: —
"At 9.30 A.M., June 23rd, I heard a report which I took to be an explosive signal from trawler Taranaki to show my periscope, I being at 30 feet. I telephoned her for confirmation and got the answer, 'Submarine 1500 yards on port bow'; and then again, as trawler altered course, 'Submarine 1000 yards astern.'
"I gave the order to slip, but the slipping gear jammed in 'C 24.' I then told Taranaki to slip her end, which she did. I went ahead, helm hard a-starboard, to attack submarine astern. The boat immediately sank to 38 feet with 5° inclination, bow down. The trim then took some time to adjust, as I had at that time 100 fathoms of 3½-inch wire hawser, 100 fathom 8-inch coir hawser, and 100 fathom telephone cable hanging from the bows. Eventually sighted enemy's conning-tower 1000 yards off. Closed to 500 yards, manœuvred for beam shot, and fired 9.55 A.M. Torpedo hit enemy amidships. I then came to the surface and picked up 'U 40's' Captain. My propeller then refused to move, and it was found that there were 20 turns of telephone cable round the shaft…"
Lieut. – Commander Edwards (in trawler Taranaki) was, of course, ignorant of the fact that "C 24" was somewhat hampered by these cables hanging at the bow: —
"… 9.30 A.M., June 23rd: Enemy submarine rose and fired a shot across my bows from 2000 yards range – shell burst 20 yards ahead – informed 'C 24' by telephone. 9.45: Slipped Taranaki's end of tow, as 'C 24's' slip had jammed. Got boat out to simulate abandoning ship and panic. Saw 'C 24's' periscope pass, attacking. 9.55: Observed torpedo run and explode under conning-tower of enemy. An officer and a petty officer the only survivors…"
Lieut. – Commander Dobson, in command of "C 27," has an abrupt and almost blasé report to make of his sinking of "U 23": —
"7.55 A.M., July 20th: Lieut. Cantlie in trawler Princess Louise telephoned to me that a hostile submarine was in sight 2000 yards on the port bow – telling me not to slip for a little while. Telephone then broke down [It would – of course].
"At 8 A.M. I heard the sound of shots falling on the water and decided to slip, which I did. Turned to starboard to get clear of trawler and came to 18 feet for a look. Closed enemy to 500 yards, and fired port tube at 8.12. As I fired I observed enemy start her engines, and torpedo missed astern. I shifted my deflection and fired the starboard tube. Torpedo hit the submarine just abaft the conning-tower. I blew main ballast tanks and picked up seven survivors (Captain, two officers, and four men). The weather being too bad to get in tow again, I returned to harbour."
Lieutenant Cantlie, in the trawler, reports: —
"7.55 A.M., July 20: Sighted hostile submarine three points on port bow, distant 2500 yards – informed 'C 27,' and told her not to slip yet. Hostile submarine steering across my bows. 7.56: Enemy opened fire, apparently trying to hit trawler. Telephone to 'C 27' broke down. 8.03 A.M.: Tow slipped. Enemy fired about seven shots altogether. Employed trawler's crew in hoisting out boat, rushing about the deck, and appearing to be in a panic. 8.10 A.M.: Observed 'C 27's' periscope on starboard quarter attacking enemy. 8.12 A.M.: Observed 'C 27' fire a torpedo, which missed astern. Cleared away starboard gun for action. Enemy opened fire again on trawler, and commenced turning to port. I opened fire with my starboard gun, hoisting white ensign at the main. At the same moment second torpedo hit just abaft enemy's conning-tower. Column of water and smoke rose about 80 feet high. As it cleared away 30 feet of bow of submarine at a large angle could be seen…"
The success of this scheme of U-boat hunting depended, of course, entirely on the secrecy maintained as to its existence; it was therefore unfortunate that the prisoners from U 23 were allowed to mix with interned German civilians who were about to be repatriated – a mistake which was excusable in the midst of the general confusion caused in the authorities' minds by the change from peace to war. At that date the disposal of prisoners was out of the Admiralty's hands, and on this mistake being discovered, steps were taken that prisoners having secrets to tell should be prevented from telling them to Germany. The trawler scheme of hunting, however, had to be given up for some time.
In 1916 U-boats again became active against the fishing fleets on the Dogger, and C boats were again sent out to work with the trawlers. On August 28, "C 29" (Lieut. Schofield), while being towed submerged, struck a mine off the Humber and was lost with all hands. The method was continued for a few more trips, but the U-boats being by then too careful, it was abandoned before the end of the year.
There were eighteen German boats in all sunk by torpedoes from our submarines, while others were hit but were able to get home. I will try to imagine a typical case of submarine v. submarine, in order to give an idea of what lies behind the bare despatches of the victors.
III
The E boat was working a "beat" ten miles to the north of the North Dogger Bank Lightship – a dull beat, too, as in 1918 the U-boat captains had long ago given up the idea of passing near lightships in surface trim. The patrol was not there for enemy submarine strafing, however. The E boat was a unit of the watching semicircle that dived eternally, from the Haaks light off the Dutch coast to Hiorn's Reef off Jutland, watching for a cloud of smoke to the east that would tell of the coming of the High Sea Fleet. The boat had been on the billet two days, and had five more to wait before she started her run home to Harwich. She had spent the short spring night jogging about on the surface at six knots, charging her batteries, and at 4 A.M. she slowed up and slipped under. It was her thirtieth patrol trip, and she expected it to be as dull as most of the others had been; there was a kind of yawning, done-it-all-before air in the way the crew took her under that morning, that showed, besides good training, a familiarity with intricate mechanism that had developed into something approaching contempt. The boat settled to her day's dive at twenty feet, her periscope moving slowly along at a speed of about two knots, leaving a very faint rippling line on the smooth North Sea surface. The Captain swung the periscope round, wiped the eyepiece with a nominally clean chamois-leather pad, and then leaned back against the diving gauge, finishing the fag-end of a cigarette. It was still twilight in the world above him, and the bad light, combined with the fact that periscopes are very apt to "fog" for some minutes after diving, when the engines are still hot enough to make the air in the boat steamy, would prevent him seeing anything clearly for twenty minutes. It was a rule of his to keep the early morning periscope watch himself, as he believed that if anything exciting was going to happen it would always occur at dawn. Certainly, as far as U-boats go, his ideas were right, as a boat on passage is humanly liable to hold on to her surface speed and trim as long as there is a hint of darkness left to protect her, and in submarine war it is the one that gets under earliest that lives longest.
The Captain took another look through the periscope, and saw the familiar level floor of the sea blending with the pink and grey of the dawn just as he had seen it on so many previous mornings. He looked forward along his boat and saw the sleeping forms of sailors all the way along the battery deck cloths till his eye was attracted by a pair of sea-boots that projected through the gap in the wardroom curtain. Those were his First Lieutenant's boots, and his First Lieutenant, he knew well, was snoring loudly beyond them. He threw his cigarette end impatiently down the periscope well and began slowly moving the heavy periscope round, shuffling around with it as he swept the clearing horizon. It seemed a silly thing to be keeping the morning watch, of all watches, when he had two young and lazy officers to work for him. Their eyes were younger than his, and his were more valuable to the country anyway. It seemed absurd that only he and four "diving hands" should be awake, while all the rest snored. Why should he, an experienced and skilled officer, be at work at half-past four on a dull morning? Why, when he was a junior Lieutenant … he straightened up from the eyepiece…
"Call the First Lieutenant!"
An hour later the situation in the E boat was the same, except for the fact that a gloomy officer in a soiled sweater and a pair of still more soiled grey flannel trousers plodded round the periscope pedestal, while a pair of stockinged feet showing through the curtain showed whither the Captain's train of thought had led him. The crew still dozed fore and aft the boat. At regular intervals the hydroplane motors buzzed noisily as a turn of the wheels corrected her depth; from right aft came the monotonous ticking of a main motor that slowly turned the port propeller and urged the boat lazily along. In the wardroom the Captain, supremely oblivious to a monotonous drip of leaking water from a seam directly over his outthrown left hand, was back in the days before the war, when the Berkeley Hounds had had three forty-five minute bursts in a day, and he had ridden all three on the same horse. In his dreams he seemed to hear the drumming of many horses' hoofs on the sloping pastures, and the clash and tinkle of stirrups touching as the crowded field fought for room at the first fence. Then he woke and lay propped on one elbow, with a leg thrown over the side of his bunk, while his heart missed two complete beats. He had not heard the order of "action stations," that came from the periscope position, but he knew well the only possible order that could send men rushing past him to man the bow tubes. He pulled his sea-boots on as he sat up, then jumped down and covered the distance aft to the periscope in half a dozen swift strides. The First Lieutenant, his face alight with suppressed emotions, stepped clear and spoke: "Fritz – bow-on, I think – big one" – then dashed forward to superintend the men at the bow tubes. All along the boat a clatter and ring of metal on metal told of preparation for firing. Amidships a hiss and splutter of air showed that the beam tubes were flooding, till a spurt of water coincided with a sharp cry of "Tubes full, sir!" The Captain spoke into the voice-pipe at his side, and the ticking sound from the main motors rose to a steady hum. He lowered the periscope till the eyepiece was level with the deck, and stood drumming his fingers against the hoisting wires. The matter of seeing the tubes cleared away and of keeping the boat's trim right lay now with his officers. His head was to be concerned only with the attack and the shot. He alone would be to blame for a miss now, and he had too well-trained a staff for him to need to worry over any diving details during an attack. His brain was working outside the boat in the early sunshine, where a big and confident U-boat was bound out for her station in the Irish Sea. The enemy was heading straight at him, and he himself was crossing her bow from port to starboard, heading north. To get his bow tubes to bear meant a quick rush to the north to get to a fair range, and then a turn to port till his head was south and the enemy ran across his sights. He was, in view of the glassy state of the sea, keeping his periscope out of sight as long as possible, and intended to keep the instrument lowered till, on his estimate of the U-boat's course and speed (gauged in his first rapid glance) and his submarine sixth sense, he had turned inwards from a point on his target's starboard bow. In sixty-five seconds from the first sighting of the enemy, peace and quiet reigned again in the E boat. Except for the occasional slight hiss and gurgle as a tube-vent was tested, there was no sign to tell that the whole boat was on a tiptoe of expectant emotion. Three minutes from his first order to increase speed he starboarded his helm and – still with his periscope lowered – began his turn through west to south. His hands fidgeted now on the taut hoisting wires before him, and every nerve in his body cried for a glance at the enemy just to check his mental estimate. His first glance when his turn was half through would show him whether he had judged rightly, or whether he had made a miscalculation which would be heavy on his soul till the end of his days. But his nerves were well in hand and his will strong; the repeater of the gyroscopic compass had ticked slowly round under his gaze until it showed 275° – a trifle north of west. Then the periscope rose with a sigh and a creak of straining wires. He stooped and pressed his eye to the instrument as it rose, waiting for the very earliest glimpse of the upper world. All along the boat the men leaned from their stations to watch, for they knew exactly what depended on the quick decision based on that first glimpse he had taken. To his eye the green flickering circle lightened, paled, and then changed to a clear pale-blue sky and a sparkling stretch of sea. He had hoisted the periscope trained to south-west by south, and his heart gave a jump in gratitude to the training that had given him brains to judge rightly. The U-boat – very near and big – with a little foaming line falling away from her bows, was sailing slowly across the periscope, and he winced as he saw on her bridge the little group of figures that seemed to be looking straight at his face. Instantly he lowered the periscope and forced himself – for he felt that he ought to whisper, in fear of his enemy hearing – to shout the order to "stand by bow tubes." A few seconds later he spoke again as the periscope rose – "Midships – steady on one-eight-five – stop starboard."
As the surface view showed again he carefully jerked the great instrument a fraction round as he set it at his "deflection" – the angle of lead ahead of the enemy, based on a guess at her speed, that corresponds to the "swing in front" of a rabbit-shooter. Then he lowered his hands from the training-handles lest he should be tempted to move the instrument again, and with the order to fire trembling on his lips, waited as the grey stem of the U-boat slid evenly into the view, and the conning-tower and the vertical spider-hair line that formed his actual sight drew together.
At the bow tubes three men and an officer crouched, the pulses of certainly one of them working at abnormal pressure. The actual firing of the tubes would come suddenly, electrically controlled by the Captain sixty feet away. Thud! the port bow torpedo left with a faint roar and rattle —Thud! the heavy ball of the starboard firing-gear came down decisively, and another "18-inch short range – high speed setting" went away on its last run. Two men by the tubes jerked up the vents to let the water rush back into the space that the torpedoes had left vacant, and each of the crouching group held his breath in agonising expectation. It was really only ten seconds (but it must have felt like a hundred) before the great question was answered: and the answer was savagely and brutally clear. A great clanging report shook the E boat, and the hull quivered as if she had lightly touched something forward. A torpedo man leaned across and closed the two spouting tube-vents, then looked aft and, grinning with relief, sang a pæan of victory along the glittering tunnel of the E boat – "Wow!" he said. "Good-bye-ee-ee!"
