John C. Fremont leaves St. Louis to lead his Army of the Southwest against the secessionist Missouri State Guards of Sterling Price.
John C. Fremont issues controversial orders imposing martial law throughout Missouri and authorizing the forced emancipation of slaves.
Political turmoil and military maneuvering continue in the bitterly divided state of Missouri.
Federal commanders accepted the surrender of the last major organized Confederate force still in the field.
September 23, 1862 – Federal forces effectively suppressed the Sioux uprising of 1862 over mistreatment on reservations and drove much of the tribe out of
September 2, 1862 – President Abraham Lincoln reinstated Major General George B. McClellan as overall Federal commander in Virginia and Washington, merging Major General John