As it was, the enemy fleet remained at its base, and in the end came forth peacefully, as has been described. Had the war gone on, had the German craft not appeared for battle, a plan to smother their base through the medium of clouds of bombing airplanes would unquestionably have been put into effect at a good and proper time. And at the same juncture, no doubt, our Sixth Squadron would have joined with the Grand Fleet in an attack upon Heligoland, plans for which are still in existence. In the waning months of the war it had become increasingly clear that the submarine as a weapon to decide the war was ineffective. Not only were the Allied destroyers and chasers, armed with their depth-bombs, waging a successful fight against the undersea boats, but other methods were beginning to have their effect. Chief among these were our mine-laying exploits, by which, in October of 1918, was established a mine-barrage across the North Sea, which proved a tremendous handicap to the German U-boats. Captain Reginald R. Belknap, U.S.N., commanding Mine Squadron I of the Atlantic Fleet, which operated in European waters, has compiled an interesting account of the important part played by the United States mine-laying squadron in planting mines in the North Sea. From the time the United States joined in the war, he says, our Navy Department urged strong measures, essentially offensive, to hem in the enemy bases, so that fewer submarines might get out, or, if already out, get back. A new American invention came to the notice of the Bureau of Ordnance, where its possibilities were quickly perceived. A few quiet but searching experiments developed it into a mine of more promising effectiveness than any ever used before, especially against submarines. This gave the United States Navy the definite means to offer an anti-submarine barrage, on the German coast or elsewhere, and the result was the northern mine-barrage in the North Sea, stretching from the Orkneys 280 miles to Norway, which the Secretary of the Navy's annual report characterizes as "the outstanding anti-submarine offensive product of of the year." Manufacture of the mines in this country--they were of the non-sweepable variety--had been going on since December, 1917. The many parts were constructed by the thousands by numerous different contractors, who delivered them at Norfolk, where the mine spheres were charged with 300 pounds of TNT, and loaded into steamers, managed by the Naval Overseas Transport Service. It required twenty-four steamers, running constantly, to keep the ten mine-planters supplied with mines. Only one fell a victim to a submarine.