On May 21, 1864, the U.S. War Department issued General Orders, No. 201, assigning Major General Irvin McDowell, to the command of the Department of the Pacific.
General Orders, No. 201
War Department, Adjutant General’s Office
Washington, May 21, 1864
Major General Irvin McDowell, U. S. Volunteers, is, by direction of the President, assigned to the command of the Department of the Pacific, Headquarters, San Francisco, California.
BY ORDER OF THE SECRETARY OF WAR:
Assistant Adjutant General.