- June 26, 1862
- September 12, 1862
- On June 26, 1862, President Abraham Lincoln ordered the consolidation of forces commanded by Major Generals John C. Frémont, Nathaniel Banks, and Irvin McDowell, and several smaller units in Eastern Virginia to form the Army of Virginia.
- Major General John Pope commanded the Army of Virginia from June 27 to September 12, 1862.
- President Abraham Lincoln’s order to create the Army of Virginia on June 26, 1862, was later codified by the War Department’s General Orders No. 103, dated August 12, 1862.
- The Left Wing of the Army of Northern Virginia defeated Nathaniel Bank’s Corps of the Army of Virginia at the Battle of Cedar Mountain (August 9, 1862).
- The Army of Northern Virginia defeated the Army of Virginia at the Second Battle of Bull Run (August 28–30, 1862).
- On September 6, 1862, the War Department issued General Orders No. 128, reassigning Major General Pope to command the Department of the Northwest, headquartered in St. Paul, Minnesota.
- On September 12, 1862, the War Department issued General Orders No. 129 ending the existence of the Army of Virginia by merging its three corps with the Army of the Potomac.