 Complete the following phrase:  LeDuc served in the American Civil War beginning in 1862, when he was made a lieutet in the Quartermaster Corps. He aided George McClellan during the peninsular campaign. His service in building corduroy roads in the retreat before the Seven Days Battles was credited by the Minnesota Historical Society as having helped save a considerable portion of the artillery. LeDuc continued to serve in the Army of the Potomac until after the Battle of Gettysburg, when he was transferred to the Western Army. In the Western Army, LeDuc was involved in the 