White’s Ford, shown in two images here, was where the bulk of Lee’s army crossed the Potomac from Virginia over three days, September 5–7. This sketch by A.R. Waud, labeled as occurring “previous to Antietam,” shows Union scouts in the foreground watching a crossing from the Maryland shore. (Library of Congress; North Wind Picture Archives/Alamy Stock Photo)

Library of Congress; North Wind Picture Archives/Alamy Stock Photo