This patrol by destroyers and light surface vessels has been criticized as affording an altogether ineffective method of protecting shipping, especially when compared with the convoy system. This criticism is, of course, justified; still we must understand that it was the only possible method until we had enough anti-submarine craft to make the convoy practicable. Nor must we forget that this Queenstown patrol was organized systematically and operated with admirable skill and tireless energy. Most of this duty fell at this time upon the British destroyers, sloops, and other patrol vessels, which were under the command of Admiral Bayly, and these operations were greatly aided by the gallant actions of the British Q-ships, or "mystery ships." Though some of the admirable exploits of these vessels will be recorded in due time, it may be said here that the record which these ships made was not only in all respects worthy of the traditions of their great service, but also that they exhibited an endurance, a gallantry, and seamanlike skill that has few parallels in the history of naval warfare. II The headquarters of the convoy system was a room in the British Admiralty; herein was the mainspring of the elaborate mechanism by which ten thousand ships were conducted over the seven oceans. Here every morning those who had been charged with the security of the Allies' lines of communication reviewed the entire submarine situation. Vice-Admiral Sir Alexander L. Duff, R.N., bore this heavy responsibility, ably assisted by a number of British officers. Captain Byron A. Long, U.S.N., a member of my staff, was associated with Admiral Duff in this important work. It was Captain Long's duty to co-ordinate the movements of our convoys with the much more numerous convoys of the Allies; he performed this task so efficiently that, once the convoy organization was in successful operation, I eliminated the whole subject from my anxieties and requested Captain Long not to inform me when troop convoys sailed from the United States or when they were due to arrive in France or England. There seemed to be no reason why both of us should lose sleep over the same cause.