Corfu (1 tender, 36 chasers) 37 Liverpool (1 oiler) 1 Naval aviation activities were almost as extensive as those of our ships, extending from England, Ireland and Northern France to eastern Italy. There were thirty aviation bases, the Northern Bombing Group considered as one base: Ireland--Queenstown (2 stations, seaplane, and assembly and repair); Whiddy Island, Wexford, Lough Foyle, Berehaven. England--Killingholme, Eastleigh. France--Dunkirk, Northern Bombing Group; Treguier, L' Aber Vrach, Fromentine, St. Trojan, Arcachon, Pauillac, La Trinite, La Pallice, Moutchic, Paimboeuf, Rochefort, Gujan, Brest, Guipivas, Le Croisic, and Ile Tudy. Italy--Lake Bolseno, Porto Corsini, Pescara. Azores--Marine Corps aviators. Two divisions of our submarines operated in European waters--seven at Berehaven, Ireland, with the _Bushnell_ as tender, and five at the Azores. Twenty-one sightings of enemy submarines and four torpedo attacks were reported by the Berehaven division. The AL-2 (Lieutenant P. F. Foster, commanding) had a remarkable encounter on July 10, 1918. Shaken by a terrific explosion, evidently that of a torpedo, the AL-2 discovered the periscope of a submarine apparently injured and attempting to get to the surface. The only chance to get the U-boat was to ram it submerged, and the AL-2 executed a crash dive, which carried it down a hundred feet. It barely missed the German, who was trying to slip under the American submarine. Swinging around, the AL-2 started again after the enemy, which was trying to rise. But it never came to the surface. Radio calls from another U-boat were unanswered. The lost submarine was the German U-B-65, known to be operating in that vicinity. "Known sunk," was the verdict of the British Admiralty, and for this the AL-2 was given the major part of the credit. Our submarines did excellent and faithful service, and proved their usefulness in that new and strange phase of undersea warfare where "sub hunts sub." Our vessels in European waters were employed in so many regions that they did not operate together as one fleet, but constituted a "task force" of the Atlantic Fleet. In British waters our ships usually operated with British forces under the direction of British officers. Elsewhere they remained under the direction of American officers, always coöperating freely with Allied naval forces. At the United States Naval Headquarters at London there was a force of 1,200. The 200 commissioned personnel included a number of the ablest officers in the Navy, with Captain (later Rear Admiral) N. C. Twining as chief of staff, and Captain W. R. Sexton as assistant chief of staff. It embraced experts whose daily association with officers in the Admiralty, under the leadership of Admiral Sims, brought about complete understanding and perfect team-work. Those at the head of important divisions were: