During the two years preceding the war Captain Reginald R. Belknap commanded the mine-laying squadron of the Atlantic fleet. Although his force was small, consisting principally of two antiquated warships, the _Baltimore_ and the _San Francisco_, Captain Belknap had performed his duties conscientiously and ably, and his little squadron therefore gave us an excellent foundation on which to build. Before the European War the business of mine-laying had been unpopular in the American navy as well as in the British; such an occupation, as Sir Eric Geddes once said, had been regarded as something like that of "rat catching"; as hostilities went on, however, and the mine developed great value as an anti-submarine weapon, this branch of the service began to receive more respectful attention. Captain Belknap's work not only provided the nucleus out of which the great American mine force was developed, but he was chiefly responsible for organizing this force. The "active front" of our mine-laying squadron was found in the North Sea; but the sources of supply lay in a dozen shipyards and several hundred manufacturing plants in the United States. We began this work with practically nothing; we had to obtain ships and transform them into mine-layers; to enlist and to train their crews; to manufacture at least 100,000 mines; to create bases both in the United States and Scotland; to transport all of our supplies more than 3,000 miles of wintry sea, part of the course lying in the submarine zone; and we had to do all this before the real business of planting could begin. The fact that the Navy made contracts for 100,000 of these new mines before it had had the opportunity of thoroughly testing the design under service conditions shows the great faith of the Navy Department in this new invention. More than 500 contractors and sub-contractors, located in places as far west as the Mississippi River, undertook the work of filling this huge order. Wire-rope mills, steel factories, foundries, machine shops, electrical works, and even candy makers, engaged in this great operation; all had their troubles with labour unions, with the railroads, and with the weather--that was the terrible winter of 1917-18; but in a few months trainloads of mine cases--great globes of steel--and other essential parts began to arrive at Norfolk, Virginia. This port was the place where the mine parts were loaded on ships and sent abroad. The plant which was ultimately constructed at this point was able to handle 1,000 mines a day; the industry was not a popular one in the neighbourhood, particularly after the Halifax explosion had proved the destructive powers of the materials in which it dealt. In a few months this establishment had handled 25,000,000 pounds of TNT. The explosive was melted in steel kettles until it reached about the density of hasty pudding; with the aid of automatic devices it was then poured into the mine cases, 300 pounds to a case, and thence moved on a