te: A corps comprises six divisions.]

After a thorough consideration of allied organizations it was decided
that our combat division should consist of four regiments of infantry of
3,000 men, with three battalions to a regiment and four companies of 250
men each to a battalion, and of an artillery brigade of three regiments,
a machine-gun battalion, an engineer regiment, a trench-mortar battery,
a signal battalion, wagon trains, and the headquarters staffs and
military police. These, with medical and other units, made a total of
over 28,000 men, or practically double the size of a French or German
division. Each corps would normally consist of six divisions--four
combat and one depot and one replacement division--and also two
regiments of cavalry, and each army of from three to five corps. With
four divisions fully trained, a corps could take over an American
sector with, two divisions in line and two in reserve, with the depot
and replacement divisions prepared to fill the gaps in the ranks.

[Sidenote: Plan of training for the infantry.]

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 Is