Allusion has been made in another chapter to the auxiliary schooner _Glen_ (alias _Sidney_ and _Athos_), which began her special service on April 5, 1917, under Lieutenant R. J. Turnbull, R.N.R. On May 17 she had a most successful duel, in which she managed to sink the small UB 39, one of those submarines about 121 feet long, and possessing extreme surface speed of 8-1/2 knots, which, armed with one gun and four torpedoes, used to come out from Zeebrugge, negotiate the Dover Straits—for which she was fitted with a net-cutter at the bows—and then operate in the English Channel. The enemy’s gun was a 22-pounder; _Glen_ carried a 12-pounder and a 3-pounder. It was six o’clock in the evening, and _Glen_ was about 35 miles south of the Needles, steering north-east, close hauled on the starboard tack, the wind being E. by S., force 4. There was a moderate sea on, and the ship was bowling along under all sail. Suddenly out of nowhere a shot was heard, and five minutes later could be seen the flash of a second, and UB 39 was sighted to the southward, 2-1/2 miles away. _Glen_ therefore backed her fore-yard, and eased away all sheets, so as to check her way. The submarine then ceased firing, but her captain must have been one of those less experienced men, who were characteristic of the later stages of the war, and did foolish things; for he was indiscreet enough in this case to close schooner, who then ‘abandoned ship.’ On came the German and submerged when 800 yards off until only her periscope and part of her bridge dodger were showing. Still she approached until now she was only 200 yards distant, steering a course parallel with the schooner on the latter’s starboard side. All this happened so quickly that the ‘panic party’ were just leaving the ship, when UB 39 rose to the surface just abaft the schooner’s beam, and now only 80 yards off. For such temerity the German, who must have been amazingly credulous, paid with his life. Lieutenant Turnbull gave the order for ‘action,’ and within five seconds the first shot from the 12-pounder was fired, which fell over the submarine abaft the conning-tower. The enemy was evidently quite surprised, for the hatch in the conning-tower was now opened, and there appeared the head and shoulders of a man who seemed dazed, and as the second 12-pounder shell came bursting on the hull under the conning-tower this man apparently fell back down the hatch.