"It was Britain's grandest struggle on the seas—in its magnitude—in its intensity—in the issues that depended upon it. There were thousands of ships engaged in it, from the great battleships down to the smallest patrol boats—from the stately liners to the dogged tramps and the plucky little trawlers. Even the pleasure boats joined in. The battle was fought in every ocean, and on every trade route. Never were the skill, the daring and the endurance of British sailors put to so stern a test; never was the superiority of their seamanship so triumphantly established. The deadly net that sought to envelop the Allied arms and leave them at the mercy of the Prussian sword was torn to shreds by the mariners of Britain. The great Allied triumph of 1917 was the gradual beating off of the submarine attack. This was the real decision of the War, for the sea front turned out to be the decisive flank in the gigantic battlefield. Here victory rested with the Allies, or rather with Britain. The moment the War became a struggle, not to beat the foe in a fight, but first to exhaust his strength and then to beat his defences down, the sea became inevitably the determining factor."