Military Division of the Pacific

The Military Division of the Pacific was a major command (Department) of the United States Army during the later 19th century.

On July 27, 1865 the Military Division of the Pacific was created under Major General Henry W. Halleck, replacing the Department of the Pacific, consisting of the Department of the Columbia that now consisted of the state of Oregon and the territories of Washington and Idaho and the expanded Department of California that now consisted of the states of California and Nevada and the Territory of New Mexico and Territory of Arizona. Headquarters for the Division of the Pacific and the Department of California remained in the City of San Francisco.

On March 18, 1868, the Army established the Department of Alaska under the Division of the Pacific. Department of Alaska was discontinued on July 1, 1870, and Alaska was absorbed by the Department of the Columbia.

The Department of Arizona was established under the Division of the Pacific on April 15, 1870. It consisted of Arizona Territory and California south of a line from the northwest corner of Arizona to Point Conception so as to include most of Southern California.

From December 7, 1871, the one general officer at San Francisco commanded both the Division of the Pacific and the Department of California and the separate staffs were consolidated into one. On July 1, 1878, Division of the Pacific headquarters moved from San Francisco to the Presidio of San Francisco.

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