The Advance Guard of the Grand Army of the United States crossing the long bridge over the Potomac, at 2 A.M. on May 21, 1861

Wood engraving by Winslow Homer; troops marching over bridge stretching off into right distance. Wood engraving by Winslow Homer; troops marching over bridge stretching off into right distance. From Harper's Weekly, June 8, 1861, page 356.
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