Upon the shoulders of the Engineering Corps of the United States Army fell the task of achieving this miracle of construction and development in France. At our entrance into the war it consisted of 256 commissioned officers and 2,100 enlisted men, in seven organizations. A year and a half later it had expanded to 9,000 officers and 255,000 enlisted men, in 309 organizations of which each did a specialized kind of work. A quarry regiment got out stone from French quarries; forestry regiments, under the permission and supervision of the French Government, went into French forests and cut down trees, set up saw mills and carried on lumbering operations in order to help supply the immense lumber needs of our construction projects and so lessen the pressure upon the shipping service; highway regiments repaired roads and built new ones; railroad regiments laid hundreds of miles of railway track; a camouflage regiment composed of architects, painters, sculptors and engineers protected and disguised army operations and ran a factory for the making of camouflage material; map-making regiments printed maps immediately behind the battle lines; others developed water and electric power and installed plants for our manufacturing necessities in more than three hundred localities; still others dug trenches and tunneled under the enemy’s lines and built bridges in the rear of the fleeing foe for the immediate passage of American troops in pursuit; and sometimes they threw down picks and shovels and with hastily seized rifles and bayonets showed themselves to be as good fighters as workers.