The engines stopped, the bows sank two feet, the order ‘Stand by to ram’ was heard, and P. 61 struck the enemy stem on, on the port side, just abaft the conning-tower. Her speed at the moment was fully 20 knots, and the impact was severe; the submarine rolled over as the stem cut into her; and when P. 61’s stern was just above her, a very violent explosion took place, giving Lieut.-Commander Worsley, for an instant, the nightmare that he had been torpedoed by another U-boat in the moment of victory. He was quickly reassured. P. 61 had suffered no damage. But round the place of collision the sea was boiling with foam; immense air-bubbles were coming to the surface in rushes, and continued for some minutes after the explosion. There was oil upon the surface, and in it two men struggling. Lifebelts were thrown to them, and boats put out. One of the two was rescued and proved to be Ober-Leutnant Alfred Arnold, the commanding officer of the U-boat--the fifth upon the list of 150 published by the British Admiralty. The submarine was U.C. 49 and lies at the bottom in forty-seven fathoms. The _San Zeferino_ was taken in tow by P.61 and came safely in after an arduous twelve hours--an admirable piece of work. Lieutenant-Commander Worsley received the D.S.O., Lieutenant Stenhouse the D.S.C., and two petty officers the D.S.M. for excellent steering and gun-laying. On this occasion the P-boat had left her patrol duty for the moment, to act as escort. This was not the case with P. 57, who had a similar success in November of the same year. In the dark of early morning, about 6 o’clock, she had just challenged and examined by searchlight a vessel which turned out to be a friend, when the forward look-out reported ‘Buoy on the port bow!’ Course was altered to examine this buoy, and on approaching it both Lieut.-Commander H. C. Birnie, R.N.R., in command of P. 57, and Lieutenant Isdale, R.N.R., his officer of the watch, simultaneously perceived it to be a large U-boat heading due west and only 200 yards distant. There was less than no time to be lost. Orders were given and obeyed instantaneously. The engines leaped to full speed as the ship came round sharply to port and steered straight for the enemy. In less than fifteen seconds the crash came--a heavy impact, at seventeen knots, on a point just before the U-boat’s conning-tower, very nearly at right angles. P. 57 cut her way right through, and as she did so the order for the depth-charges reached the officer of the watch. The first charge was released with great promptitude and precision as the damaged submarine passed under the ship’s stern. P. 57 turned sixteen points and came back over the spot, when a second charge was immediately dropped and a buoy put down.