Department of Oregon

10, of the United States Department of War, Adjutant-General's Office, September 13, 1858.

[1] Its first commander was Brevet Brigadier General William S. Harney, U.S. Army, from 1858 to June 1860.

Shortly after he took command he sent troops under Captain George E. Pickett to San Juan Island precipitating the Pig War with Great Britain.

Due to these altercations with the British he was recalled in June 1860 by the United States Secretary of War who reassigned Harney to the Department of the West, replacing him with the victor of the Oregon Indian Wars, Colonel George Wright, of the U.S. 9th Infantry Regiment, from June 8, 1860.

The Department of Oregon was merged into the restored Department of the Pacific on January 15, 1861, as the District of Oregon administering the same territories, under Col.