Jericho Mills, Virginia. Party of the 50th New York Engineers building a road on the south bank of the North Anna, with a general headquarters wagon train crossing the pontoon bridge, May 24, 1864 (Timothy O'Sullivan/ Library of Congress)

Jericho Mills, Virginia. Party of the 50th New York Engineers building a road on the south bank of the North Anna, with a general headquarters wagon train crossing the pontoon bridge, May 24, 1864 (Timothy O’Sullivan/ Library of Congress)