The demobilization of this industry was accomplished rapidly. Orders were cut to the bone, merely enough post-armistice production being allowed to enable the plants to dovetail their war business into the resumption of their commercial businesses. Since little special-purpose machinery was required in producing war tractors, the Ordnance Department created no manufacturing center after the armistice as a source of future supply. The war left the Army, however, with a number of engineers who had gained experience in adapting mechanical power to military uses in the field, and these men are continuing a development which, doubtless, will in time eliminate the horse from our artillery regiments. One of the innovations of the war was the motor-driven mobile repair shop for repairing artillery in the field. Each shop consisted of two sections, with fifteen trucks and fourteen trailers in each section--nearly sixty vehicles to the entire shop. On the trailers were installed the heavy machine tools, and one trailer of each section was equipped with an electric generator for light and power. When the shop was set up for business it presented the spectacle of two rings of vehicles ranged around the two power plants and hooked up with electric cables. The manufacturing program, both before and after the armistice, produced sixteen such shops, consisting of 600 vehicles. Six of these shops have been stored; ten are in use by the permanent establishments. In addition, in terminating the contracts the Ordnance Department came into possession of the unassembled but finished components of eight additional shops. Thousands of jigs, fixtures, and small tools used in this manufacturing project have been stored away and catalogued. Tank production was drastically curtailed immediately after the armistice. The tank contracts involved the expenditure of $175,000,000. The total production of 6-ton Renault tanks was limited to 950, of which sixty-four were produced before the armistice. The contracts with the Ford Motor Company to build 15,000 3-ton tanks were terminated at once after the armistice, production being limited to the fifteen trial machines produced before November 11, 1918. Of the great 36-ton tanks, Anglo-American design, the Ordnance Department built 100 at Rock Island Arsenal after the armistice, procuring from the British for the purpose the hulls and guns. The tank assembly plant at Châteauroux, France, went to the French Government in the general settlement of 1919 and is now being used as a car repair shop.