Raft of blanket boats ferrying field artillery and men over the Potomac River in Virginia, July 1863. Photograph by A.J. Russell.

Source

chrome-spokes: First of heard of “blanket boats”, thanks! …

One description, “…for crossing streams by means of boats, constructed of a single rubber blanket… .” — https://deadconfederates.com/tag/blanket-boats/

More from a blog discussion… https://civilwartalk.com/threads/soldiers-testing-blanket-boat-raft.90812/