On May 16, Battery E moved toward Vicksburg, the South's "Gibraltar of the West". It arrived on the 18th, where it took an active part in the siege as part of the Third Division of Sherman's XV Corps. Fielding four James Rifles and three captured 6-pound guns, it was assigned together with the 2nd Battery of Iowa Light Artillery as the division's artillery force near the northeast corner of the Confederate defensive line (currently located along Old Graveyard Road, between Union Ave. and Confederate Ave.). They supported the abortive Federal assault upon the "Stockade Redan" on May 22, which resulted in more than a thousand Federal casualties, and led to the awarding of 78 Medals of Honor to attacking soldiers. A photo of the exact location of Battery E's position at Vicksburg may be seen here. The larger page from which this photo was taken may be viewed here.