License, verbatimUS-PD
The New York Public Library states no known U.S. copyright for this item. Pinax admits it as US-PD only because the work predates 1900, making public domain near-certain worldwide; status outside the U.S. is not asserted and reuse elsewhere is the user's responsibility. Credit: From The New York Public Library.
Retreat of Gen. Lee's army, July 13th, 1863, crossing the Potomac above Williamsport, Md.. 1863 (from title). The New York Public Library.