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moment when the war would end. They did not like the idea of adding the United States to their enemies, but this was because they were thinking of conditions after the war; for they would have preferred to have had American friendship in the period of readjustment. But they did not fear that we could do them much injury in the course of the war itself. This again was not because they really despised our fighting power; they knew that we would prove a formidable enemy on the battlefield; but the obvious fact, to their eyes, was that our armies could never get to the front in time. The submarine campaign, they said, would finish the thing in three or four months; and certainly in that period the unprepared United States could never summon any military power that could affect the result. Thus from a purely military standpoint the entrance of 100,000,000 Americans affected them about as much as would a declaration of war from the planet Mars.

      We confirmed this point of view from the commanders of the occasionally captured submarines. These men would be brought to London and questioned; they showed the utmost confidence in the result.

      "Yes, you've got us," they would say, "but what difference does that make? There are plenty more submarines coming out. You will get a few, but we can build a dozen for every one that you can capture or sink. Anyway, the war will all be over in two or three months and we shall be sent back home."

      All these captives laughed at the merest suggestion of German defeat; their attitude was not that of prisoners, but of conquerors. They also regarded themselves as heroes, and they gloried in the achievements of their submarine service. For the most part they exaggerated the sinkings and estimated that the war would end about the first of July or August. Similarly the Berlin Government exaggerated the extent of their success. This was not surprising, for one peculiarity of the submarine is that only the commander, stationed at the periscope, knows what is going on. He can report sinking a 5,000 ton ship and no one can contradict his statement, for the crew and the other officers do not see the surface of the water. Not unnaturally the commander does not depreciate his own achievements, and thus the amount of sunken tonnage reported in Berlin considerably exceeded the actual losses.

      The speeches of German dignitaries resounded with the same confidence.

      "In the impending decisive battle," said the Kaiser, "the task falls upon my navy of turning the English war method of starvation, with which our most hated and most obstinate enemy intends to overthrow the German people, against him and his allies by combating their sea traffic with all the means in our power. In this work the submarine will stand in the first rank. I expect that this weapon, technically developed with wise forethought at our admirable yards, in co-operation with all our other naval fighting weapons and supported by the spirit which, during the whole course of the war, has enabled us to perform brilliant deeds, will break our enemy's war will."

      "In this life and death struggle by hunger," said Dr. Karl Helfferich, Imperial Secretary of the Interior, "England believed herself to be far beyond the reach of any anxiety about food. A year ago it was supposed that England would be able to use the acres of the whole world, bidding with them against the German acres. To-day England sees herself in a situation unparalleled in her history. Her acres across sea disappear as a result of the blockade which our submarines are daily making more effective around England. We have considered, we have dared. Certain of the result, we shall not allow it to be taken from us by anybody or anything."

      II

      How, then, could we defeat the submarine? Before approaching this subject, it is well to understand precisely what was taking place in the spring and summer of 1917 in those waters surrounding the British Isles. What was this strange new type of warfare that was bringing the Allied cause to its knees? Nothing like it had ever been known in recorded time; nothing like it had been foreseen when, on August 4, 1914, the British Government threw all its resources and all its people against the great enemy of mankind.

      Leaving entirely out of consideration international law and humanity, it must be admitted that strategically the German submarine campaign was well conceived. Its purpose was to marshal on the German side that force which has always proved to be the determining one in great international conflicts—sea power. The advantages which the control of the sea gives the nation which possesses it are apparent. In the first place, it makes secure such a nation's communications with the outside world and its own allies, and, at the same time, it cuts the communications of its enemy. It enables the nation dominant at sea to levy upon the resources of the entire world; to obtain food for its civilian population, raw materials for its manufactures, munitions for its armies; and, at the same time, to maintain that commerce upon which its very economic life may depend. It enables such a power also to transport troops into any field of action where they may be required. At the very time that sea power is heaping all these blessings upon the dominant nation, it enables such a nation to deny these same advantages to its enemy. For the second great resource of sea power is the blockade. If the enemy is agriculturally and industrially dependent upon the outside world, sea power can transform it into a beleaguered fortress and sooner or later compel its unconditional surrender. Its operations are not spectacular, but they work with the inevitable remorselessness of death itself.

      This fact is so familiar that I insist upon it here only for the purpose of inviting attention to another fact which is not so apparent. Perhaps the greatest commonplace of the war, from the newspaper standpoint, was that the British fleet controlled the seas. This mere circumstance, as I have already said, was the reason why all students of history were firm in their belief that Britain could never be defeated. It was not until the spring of 1917 that we really awoke to the actual situation; it was not until I had spent several days in England that I made the all-important discovery, which was this—that Britain did not control the seas. She still controlled the seas in the old Nelsonian sense; that is, her Grand Fleet successfully "contained" the German battle squadrons and kept them, for the greater part of the war, penned up in their German harbours. In the old days such a display of sea power would have easily won the war for the Allies. But that is not control of the seas in the modern sense; it is merely control of the surface of the seas. Under modern methods of naval warfare sea control means far more than controlling the top of the water. For there is another type of ship, which sails stealthily under the waves, revealing its presence only at certain intervals, and capable of shooting a terrible weapon which can sink the proudest surface ship in a few minutes. The existence of this new type of warship makes control of the seas to-day a very different thing from what it was in Nelson's time. As long as such a warship can operate under the water almost at will—and this was the case in a considerable area of the ocean in the early part of 1917—it is ridiculous to say that any navy controls the seas. For this subsurface vessel, when used as successfully as it was used by the Germans in 1917, deprives the surface navy of that advantage which has proved most decisive in other wars. That is, the surface navy can no longer completely protect communications as it could protect them in Nelson's and Farragut's times. It no longer guarantees a belligerent its food, its munitions, its raw materials of manufacture and commerce, or the free movement of its troops. It is obviously absurd to say that a belligerent which was losing 800,000 or 900,000 tons of shipping a month, as was the case with the Allies in the spring of 1917, was the undisputed mistress of the seas. Had the German submarine campaign continued to succeed at this rate, the United States could not have transported its army to France, and the food and materials which we were sending to Europe, and which were essential to winning the war, could never have crossed the ocean.

      That is to say, complete control of the

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