The Department of Arizona was a military department of the United States Army that existed from 1870 to 1893. It was subordinate to the Military Division of the Pacific and comprised posts in Arizona and Southern California. It was the successor to the District of Arizona within the Department of California. From 1870 to 1886, Fort Whipple, Arizona was the department's headquarters. Afterwards it was headquartered at Drum Barracks in Wilmington, California.
Commanders Colonel George Stoneman, May 3, 1870, to June 4, 1871 Lieutenant Colonel George Crook, June 4, 1871, to Mar. 22, 1875 Major General August Kautz, Mar. 22, 1875 - Mar. 5, 1878 Brigadier General Orlando B. Willcox, Mar. 5, 1878, to September 4, 1882 Brigadier General George Crook, September 4, 1882 to April 11, 1886 Brigadier General Nelson A. Miles, April 11, 1886 - November 26, 1888 Colonel Benjamin Grierson November 26, 1888 - September 16, 1890 Brigadier General Alexander McDowell McCook, September 16, 1890 to July 6, 1893
Posts Fort Breckenridge 1857–1861, Fort Stanford 1862, Camp Wright 1865, Camp Grant 1865-1873 Fort Mojave 1858–1861, 1863–1890 Fort Bowie 1862–1894 Fort Cerro 1863 - ? Fort Whipple, Arizona 1864-1913 Camp on the Colorado River, Camp Colorado 1864 - 1871, near Parker Yuma Depot 1864 - 1891 Camp Devin, renamed Camp Toll Gate until 1870, Camp Hualpai, 1869 - 1873, near Paulden
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