Early in 1918, at the request of the British Government, we took over a large seaplane base which had been established by the British at Killingholme, England, a little sea-coast town at the mouth of the Humber River. According to the original plan we intended to co-operate from this point with the British in a joint expedition against enemy naval bases, employing for this purpose especially constructed towing lighters, upon which seaplanes were to be towed by destroyers to within a short flying distance of their objectives. Although this project was never carried out, Killingholme, because of its geographical location, became a very important base for seaplanes used in escorting mercantile convoys to and from Scandinavian ports, patrolling mine-fields while on the lookout for enemy submarines and making those all-important reconnaissance flights over the North Sea which were intended to give advanced warning of any activity of the German High Seas Fleet. These flights lasted usually from six to eight hours; the record was made by Ensigns S. C. Kennedy and C. H. Weatherhead, U.S.N., who flew for nine hours continuously on convoy escort duty. For a routine patrol, this compares very favourably indeed with the flight of the now famous trans-Atlantic _NC-4_. I can no better describe the splendid work of these enthusiastic and courageous young Americans than by quoting a few extracts from a report which was submitted to me by Ensign K. B. Keyes, of a reconnaissance flight in which he took part, while attached temporarily to a British seaplane station under post-graduate instruction. The picture given by Ensign Keyes is typical of the flights which our boys were constantly making: On June 4, 1918, we received orders to carry out a reconnaissance and hostile aircraft patrol over the North Sea and along the coast of Holland. It was a perfect day for such work, for the visibility was extremely good, with a light wind of fifteen knots and clouds at the high altitude of about eight or ten thousand feet. Our three machines from Felixstowe rose from the water at twelve o'clock, circled into patrol formation, and proceeded north-east by north along the coast to Yarmouth. Here we were joined by two more planes, but not without some trouble and slight delay because of a broken petrol pipe which was subsequently repaired in the air. We again circled into formation, Capt. Leckie, D.S.O., of Yarmouth, taking his position as leader of the squadron. At one o'clock the squadron proceeded east, our machine, being in the first division, flew at 1,500 feet and at about half a mile in the rear of Capt. Leckie's machine, but keeping him on our starboard quarter.