Our purpose was to prepare an integral American force which should be able to take the offensive in every respect. Accordingly, the development of a self-reliant infantry by thorough drill in the use of the rifle and in the tactics of open warfare was always uppermost. The plan of training after arrival in France allowed a division one month for acclimatization and instruction in small units from battalions down, a second month in quiet trench sectors by battalion, and a third month after it came out of the trenches when it should be trained as a complete division in war of movement. [Sidenote: The school center at Langres.] [Sidenote: British and French officers assist.] Very early a system of schools was outlined and started, which should have the advantage of instruction by officers direct from the front. At the great school center at Langres, one of the first to be organized, was the staff school, where the principles of general staff work, as laid down in our own organization were taught to carefully selected officers. Men in the ranks, who had shown qualities of leadership, were sent to the school of candidates for commissions. A school of the line taught younger officers the principles of leadership, tactics, and the use of the different weapons. In the artillery school, at Saumur, young officers were taught the fundamental principles of modern artillery; while at Issoudun an immense plant was built for training cadets in aviation. These and other schools, with their well-considered curriculums for training in every branch of our organization, were coordinated in a manner best to develop an efficient army out of willing and industrious young men, many of whom had not before known even the rudiments of military technique. Both Marshal Haig and General Petain placed officers and men at our disposal for instructional purposes, and we are deeply indebted for the opportunities given to profit by their veteran experience. [Sidenote: Questions of communication and supply.] The eventual place the American Army should take on the western front was to a large extent influenced by the vital questions of communication and supply. The northern ports of France were crowded by the British Armies' shipping and supplies while the southern ports, though otherwise at our service, had not adequate port facilities for our purposes and these we should have to build. The already overtaxed railway system behind the active front in northern France would not be available for us as lines of supply and those leading from the southern ports of northeastern France would be unequal to our needs without much new construction. Practically all warehouses, supply depots and regulating stations must be provided by fresh constructions. While France offered us such material as she had to spare after a drain of three years enormous quantities of material had to be brought across the Atlantic. [Sidenote: Plans for construction on a vast scale.]