of water leaped up, directly under the U-boat’s conning-tower, and she disappeared instantly. Ten minutes afterwards, G. 13 was on the surface, and making her way through a vast lake of oil, which lay thickly upon the sea over an area of a mile. In such an oil lake a swimmer has no margin of buoyancy, and it was not surprising that there were no survivors to pick up. The only relics of the U-boat were some pieces of board from her interior fittings. G. 13 completed her patrol of twenty-eight days, and returned to her base without sighting another enemy--she had cleared that area for a month. A successful hunt by Lieutenant North, in command of H. 4, resembles G. 13’s exploit in many respects, but has this picturesque difference, that it took place in southern waters and in a bright May midnight. It was more than forty-eight hours since H. 4 had cast off from the pens before she sighted the quarry she was looking for, 3 points on her port bow. The hour was 11.10 P.M. and the moon was nearly full. Lieutenant North at once turned towards the enemy and went to night action stations. The distance between the two boats was about 1,000 yards, and it was desirable to reduce this to a minimum--say to 250 yards--in order to make sure of a hit in the circumstances. The enemy was a large U-boat and was going about 8 knots, in a course which would bring her across H. 4 almost too directly. But she had not advanced more than 300 yards when she altered course 8 points to starboard. Lieutenant North instantly saw his opportunity, turned first to port to cut her off; and then, when his superior speed had made this a certainty, 8 points to starboard to close her. Within four minutes after sighting her, he had placed himself on her port beam at the desired range of 250 yards. He fired two torpedoes. Both hit and detonated, one under the conning-tower, and one in the engine-room. The enemy sank immediately--in fifteen seconds she had gone completely. Then came the usual search for survivors, and two were eventually rescued; they were the captain of the boat and his quartermaster. H. 4 combed out the surrounding area thoroughly; but no more could be found; and in view of the presence of prisoners, Lieutenant North at once returned to his base.