- the department of the federal government that, from 1789 until 1947, was responsible for defense and the military establishment: in 1947 it became the Department of the Army, which became part of the Department of Defense when it was established in 1949.
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Examples from the Web for war department
See also, on the power of Orry in the war-department, Mmoires de Berwick, vol.History of Civilization in England, Vol. 2 of 3
Henry Thomas Buckle