Ninth Army Corps

On September 17, 1862, the U.S.A. Ninth Army Corps's Welsh's Brigade of Willcox's Division, commanded by Col. Thomas Welsh of the 45th Pennsylvania Infantry and composed of the 8th Michigan Infantry, 46th New York Infantry, and 45th and 100th Pennsylvania Infantry, was in reserve in the morning on the eastern slope of the ridge on the left bank of the Antietam, nearly opposite Burnside Bridge. About 2 p.m., after Sturgis' Division carried the bridge, the brigade crossed and followed the road toward Sharpsburg for about 250 yards before forming line west of the road. It then advanced over the high ground west of the road, gradually crossing eastward until its right was near this point, its center in the ravine and at the stone mill, and its left in the apple orchard beyond, when A.P. Hill's attack on the corps's left flank compelled it to withdraw to the banks of the Antietam, where it remained until the evening of the 18th.

Maryland · United States