[1] The 11th Mississippi saw action at the Battle of First Manassas under General Barnard Elliott Bee, before being assigned to the Army of Northern Virginia.

In Virginia in 1862, the 11th Regiment fought at Seven Pines, the Seven Days Battles near Richmond, and Second Manassas under the command of General William H.C. Whiting.

[2] In late 1862, the 11th Regiment was reassigned to the command of General Joseph R. Davis, and was sent north as part of the Gettysburg Campaign in the summer of 1863.

During the second day of the Battle of Gettysburg, the 11th fought at Cemetery Ridge, taking heavy fire while charging the Union lines.

After being moved back to Petersburg, Virginia, the 11th formed part of the defending Confederate force during the siege of that city until the Union breakthrough in early April, 1865.