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but unseen” that makes this type of vessel the ideal torpedo-boat. But, like everything else, there are limits to its use, for a submarine, although it can navigate on the surface like an ordinary torpedo-boat, cannot deliver a submerged attack at night owing to the periscopes, which are the “eyes” of these underwater fighting ships, being useless in the dark. When night covers the sea, however, the chances of the fast grey-painted surface torpedo-boat or destroyer being able to approach the enemy unseen are more than doubled, and in this way fleets become exposed to submarine torpedo attack by day and surface torpedo attack by night. Further, a submarine will often attack while a seaplane hovers over the enemy in order to draw attention. It is this constant exposure to sudden and unseen submarine attack which is primarily responsible for the terrible nerve strain imposed on the crews of modern surface warships in time of war.

      Owing to the ability of submarines to deliver stealthy attacks by day, naval tacticians have designated this type of craft “Daylight torpedo-boats,” but they are rapidly passing beyond the purely torpedo and coastal defensive stage and are taking on to themselves the rôle of the ocean cruiser. The size of these vessels has increased from 50 to 1,000 tons displacement in ten years. They now carry not only a considerable number of the largest size torpedo but also quick-firing guns for repelling attacks by small surface vessels, and are capable of accompanying fleets to sea. The Australian naval submarines A.E.1 and A.E.2 both made the voyage from Barrow to Sydney under their own power and without convoy. The radius of action of the latest vessels both of the British and French Navies amounts to several thousand miles. In the case of the British “F” class the displacement has risen to 1,500 tons, the speed to 20 knots and the armament to six torpedo tubes and four 12-pounder quick-firing guns, thus making them in every sense ocean cruisers capable of keeping the sea in almost any weather and possessing wide range of action and considerable offensive power. Hitherto British submarines, like the ordinary surface torpedo-boats, have been known by numbers only, but the latest vessels are to receive names which indicates the increase in size and importance of these craft. They may be termed the advance guards of the submarine battleships of the future.

      The torpedo, which is the principal arm of the submarine boat, is itself a submarine projectile. After being discharged from the firing tube it sinks a short distance below the surface and is propelled by its own engines at a high rate of speed in a straight line towards its object of attack. Great improvements have been made during the past ten years in the construction of these delicate weapons. The extreme effective range and speed has risen from 4,000 yards at 18 knots to 7,000 yards at 45 knots or 11,000 yards at 30 knots. The “war-head” or front section of the torpedo contains a charge of about 200 pounds of damp gun-cotton which is fired by a detonator on the torpedo striking an object. This very powerful explosive charge is capable of tearing open an enormous hole in the unprotected under-water skin of the surface warship. The type of weapon used in the British, French, Russian and Japanese Navies is the Whitehead torpedo (18-inch and 21-inch). The German Navy uses the Schwartzkopf torpedo (18-inch and 21-inch), which is very similar to the Whitehead and is a very powerful weapon.

      In the first phase of the naval war no less than eight warships have been sunk by submarine torpedoes.

      The activity of the British submarines in the theatre of war, from the beginning of hostilities, is admirably set forth in the following dispatch from Commodore Roger B. Keyes, C.B., which is the first dispatch in the history of naval warfare to describe in detail submarine attack and reconnaissance:—

      H.M.S. Maidstone,

      17th October, 1914.

      “Sir—In compliance with Their Lordships’ directions, I have the honour to report as follows upon the services performed by the Submarines since the commencement of hostilities:—

      “Three hours after the outbreak of war, Submarines E.6 (Lieutenant-Commander Cecil P. Talbot), and E.8 (Lieutenant-Commander Francis H. H. Goodhart), proceeded unaccompanied to carry out a reconnaissance in the Heligoland Bight. These two vessels returned with useful information, and had the privilege of being the pioneers on a service which is attended by some risk.

      “During the transportation of the Expeditionary Force the Lurcher and Firedrake and all the Submarines of the Eighth Submarine Flotilla occupied positions from which they could have attacked the High Sea Fleet, had it emerged to dispute the passage of our transports. This patrol was maintained day and night without relief, until the personnel of our Army had been transported and all chance of effective interference had disappeared.

      “These Submarines have since been incessantly employed on the Enemy’s Coast in the Heligoland Bight and elsewhere, and have obtained much valuable information regarding the composition and movement of his patrols. They have occupied his waters and reconnoitred his anchorages, and, while so engaged, have been subjected to skilful and well executed anti-submarine tactics; hunted for hours at a time by Torpedo Craft and attacked by gun-fire and torpedoes.

      “At midnight on August 26th, I embarked in the Lurcher, and, in company with Firedrake and Submarines D.2, D.8, E.4, E.5, E.6, E.7, E.8, and E.9 of the Eighth Submarine Flotilla, proceeded to take part in the operations in the Heligoland Bight arranged for August 28th. The Destroyers scouted for the Submarines until nightfall on the 27th, when the latter proceeded independently to take up various positions from which they could co-operate with the Destroyer Flotillas on the following morning.

      “At daylight on August 28th the Lurcher and Firedrake searched the area, through which the Battle Cruisers were to advance, for hostile Submarines, and then proceeded towards Heligoland in the wake of Submarines E.6, E.7, and E.8, which were exposing themselves with the object of inducing the enemy to chase them to the westward.

      “On approaching Heligoland, the visibility, which had been very good to seaward, reduced to 5,000 to 6,000 yards, and this added considerably to the anxieties and responsibilities of the Commanding Officers of Submarines, who handled their vessels with coolness and judgment in an area which was necessarily occupied by friends as well as foes.

      “Low visibility and calm sea are the most unfavourable conditions under which Submarines can operate, and no opportunity occurred of closing with the Enemy’s Cruisers to within torpedo range.

      “Lieutenant-Commander Ernest W. Leir, Commanding Submarine E.4, witnessed the sinking of the German Torpedo-Boat Destroyer V.187 through his periscope, and, observing a Cruiser of the Stettin class close, and open fire on the British Destroyers which had lowered their boats to pick up the survivors, he proceeded to attack the Cruiser, but she altered course before he could get within range. After covering the retirement of our Destroyers, which had had to abandon their boats, he returned to the latter, and embarked a Lieutenant and nine men of Defender, who had been left behind. The boats also contained two Officers and eight men of V.187, who were unwounded, and eighteen men who were badly wounded. As he could not embark the latter, Lieutenant-Commander Leir left one of the Officers and six unwounded men to navigate the British boats to Heligoland. Before leaving he saw that they were provided with water, biscuit, and a compass. One German Officer and two men were made prisoners of war.

      “Lieutenant-Commander Leir’s action in remaining on the surface in the vicinity of the enemy and in a visibility which would have placed his vessel within easy gun range of an enemy appearing out of the mist, was altogether admirable.

      “This enterprising and gallant Officer took part in the reconnaissance which supplied the information on which these operations were based, and I beg to submit his name, and that of Lieutenant-Commander Talbot, the Commanding Officer of E.6, who exercised patience, judgment, and skill in a dangerous position, for the favourable consideration of Their Lordships.

      “On September 13th, E.9 (Lieutenant-Commander Max K. Horton) torpedoed and sank the German Light Cruiser Hela six miles South of Heligoland.

      “A number of Destroyers were evidently called to the scene after E.9 had delivered her attack, and these hunted her for several hours.

      “On September 14th, in accordance with his orders, Lieutenant-Commander Horton examined the outer anchorage of Heligoland, a service attended by considerable risk.

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