the layman as not particularly desperate. But any such basis of comparison is absurd. The destroyers were operating on the surface in full view of the submarines; the submarines could submerge at any time and make themselves invisible; and herein we have the reason why the contest was so markedly unequal. But aside from all other considerations, the method of warfare adopted by the Allies against the U-boat was necessarily ineffective, but was the best that could be used until sufficient destroyers became available to convoy shipping. The so-called submarine patrol, under the circumstances which prevailed at that time, could accomplish very little. This little fleet of destroyers was based on Queenstown; from this port they put forth and patrolled the English Channel and the waters about Ireland in the hope that a German submarine would stick its nose above the waves. The central idea of the destroyer patrol was this one of hunting; the destroyer could have sunk any submarine or driven it away from shipping if the submarine would only have made its presence known. But of course this was precisely what the submarine declined to do. It must be evident to the merest novice that four or five destroyers, rushing around hunting for submarines which were lying a hundred feet or so under water, could accomplish very little. The under- water boat could always see its surface enemy long before it was itself seen and thus could save its life by the simple process of submerging. It must also be clear that the destroyer patrol could accomplish much only in case there were a very large number of destroyers. We figured that, to make the patrol system work with complete success, it would be necessary to have one destroyer for every square mile. The area of the destroyer patrol off Queenstown comprised about 25,000 square miles; it is apparent that the complete protection of the trans-Atlantic trade routes would have taken about 25,000 destroyers. And the British, as I have said, had available anywhere from four to fifteen in this area.
The destroyer flotilla being so small, it is not surprising that the German submarines were making ducks and drakes of it. The map of the sinkings which took place in April brings out an interesting fact: numerous as these sinkings were, very few merchantmen were torpedoed, in this month, at the entrance to the Irish Sea or in the English Channel
