Federal troops occupy Chatanooga and Knoxville, Tennessee as well as Leesburg, Virginia.
At Pea Ridge Arkansas, Federal troops defeat Confederates and Indians in the largest battle of the war west of the Mississippi River. 2,200 total casualties result and the rebels are forced to evacuate Arkansas.
Union forces begin bombarding Vicksburg, Mississippi.
Confederate troops invade Kentucky, capturing Lexington.
Federal troops retake Clarksville, Tennessee.