The tank, which was the answer to the machine gun, was one of the important new weapons evolved by the war, its basic idea having been suggested by the American farm caterpillar tractor, from which a British engineer worked out the formidable engine of battle which it became. Early in our participation the American Government began arrangements for a considerable tank production and experiments and investigations were started to better the design of those in use in the Allied armies. A Tank Corps was formed to have charge of the recruiting and training of the personnel, which numbered thousands of well trained men, but design and production remained in the hands of the Ordnance Department. The United States adopted two types, one the smaller form used by the French Army, of which 4,000 were being made, and the other a modification and improvement of the large tank used by the British, with whom a joint program of tank construction was being carried out when the armistice was signed. Liberty motors furnished motive power, which gave a speed of eleven miles per hour, and each carried a crew of eleven men, two six-inch guns and several machine guns. Some were equipped with wireless. This huge tank, finished examples of which had been tested and approved, was forty feet long and could climb steep hills, cross trenches and smash down large trees. It would have been taken across the ocean by hundreds during the winter and great companies of them would have plunged into the enemy’s lines with the resumption of fighting in the spring of 1919. The component parts of a goodly number had already been made in the United States and sent to England for assembly.