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When the United States entered the Great War in April of 1917, there were few officers with any staff training, and none had actually served on large, complex staffs in combat.

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This is the first study to analyze the content, training, and performance of a World War I draft division from its formation onward.

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The Rainbow Division (42nd Infantry Division) was the premier National Guard division to fight on the Western Front in the Great War. Patton's tanks supported The Rainbow Division during the St. Mihiel operations, the first time the legendary Patton planned for the use of tanks on the battlefield.

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When the United States went to war in April 1917 the Army's Air Service had one squadron of obsolete aircraft. By November 1918 the Air Service had aero squadrons which were specialized in air combat, observation, bombing, and photography. Each combat division habitually had an air observation squadron and a balloon company attached.