Burnham's Light Division was the right flank anchor of Sedgwick's line when VI Corps stood on the defensive during the later stages of the Battle of Salem Church. Only lightly engaged, Burnham was able to send two regiments to help repel a Confederate attack on the left flank. The 6th Maine of Burnham's command was one of the rearguard units when the corps retreated across the Rappahannock River. The Light Division was dissolved after the Battle of Chancellorsville, and Burnham's regiment joined the 3rd Brigade, 1st Division, VI Corps under Brig. Gen. David Allen Russell. In that capacity he was present in reserve behind Little Round Top at the Battle of Gettysburg. A monument to the regiment stands on Howe Avenue behind the Round Top.