Jericho Mills, Virginia. Looking up the North Anna river from the south bank, with a canvas pontoon bridge and pontoon train on the opposite bank, May 24, 1864 (Timothy O'Sullivan/ Library of Congress)

Jericho Mills, Virginia. Looking up the North Anna river from the south bank, with a canvas pontoon bridge and pontoon train on the opposite bank, May 24, 1864 (Timothy O’Sullivan/ Library of Congress)