Example image of eyePlorer eyePlorer map for 'Irvin McDowell': American Civil War First Battle of Bull Run United States United States Army Columbus, Ohio John Buford France P.G.T. Beauregard United States Military Academy Aide-de-camp John E. Wool Mexican–American War Military tactics Battle of Buena Vista Brevet (military) Army of the Potomac Brigadier general (United States) Regular Army (United States) Salmon P. Chase United States Secretary of the Treasury Confederate States Army Northern Virginia Politician Washington, D.C. George B. McClellan Major general (United States) Union Army I Corps (Union Army) Jackson's Valley Campaign Peninsula Campaign Stonewall Jackson John C. Frémont Nathaniel Prentice Banks Army of Virginia John Pope (military officer) Battle of Cedar Mountain Second Battle of Bull Run Court-martial of Fitz John Porter Fitz John Porter Department of the Pacific Arkansas California Department of the West Fourth Military District Reconstruction era of the United States President of the United States Rutherford B. Hayes San Francisco Presidio of San Francisco San Francisco National Cemetery