OUR ACHIEVEMENTS IN 1917.--- As a result of our unwillingness, before 1917, to face the fact that we might sometime be involved in war, the tremendous amount of preparation described in this chapter had to be done in a few months, or even in a few weeks. When things have to be done in such a great hurry, missteps are often made and unfortunate delays result. In spite of all difficulties, however, the United States had, at the end of 1917, two hundred and fifty thousand troops in France and a million and a half in training camps. Guns, rifles, clothing, shoes, food, and other necessary supplies were being produced in sufficient quantities. On the other side of the Atlantic, our engineers and railroad men were busy constructing docks, warehouses, and miles of railroad for the purpose of providing bases of supplies for our soldiers in France. Much of the equipment of these railroads and docks cars, locomotives, and unloading machinery--had been brought from America. MORE SOLDIERS SENT TO FRANCE.--As the troops in the various camps and cantonments were trained they were sent to ports on the eastern coast and embarked for France, their places in camp being taken by new groups of drafted men. Beginning with fifty or sixty thousand each month, the number sent abroad was rapidly increased until by the fall of 1918 the troops were going over at the rate of more than three hundred thousand a month. By October 15 there were over two million of our soldiers in France and another million and more under training in this country. DECREASE IN SUBMARINE SINKINGS.--The Germans had boasted in vain that their submarines would prevent the transportation of American troops to Europe. Of the hundreds of transports engaged in this work, up to November, 1918, only two were sunk while on the eastward voyage, and less than 300 American soldiers were drowned. Moreover, during the year 1918 there was a notable decrease in the destruction of merchant vessels by submarines. This was due probably to a variety of causes, but especially to the increased protection provided by the convoy system, and to the more efficient methods of fighting the submarines. It has been found that it is possible to see a submarine at some distance below the surface if the observer is in a balloon or an airplane. Therefore the submarine hunters do not need to wait for the submarine to show itself. The sea is patrolled by balloons and airplanes in conjunction with fast destroyers. When the aircraft has located a submarine, the fact is signaled to a destroyer. When the destroyer arrives over the submarine, it drops a depth bomb, which is arranged to explode after it has sunk to any desired depth in the water.