May 1864. "Virginia. Pontoon bridge across the North Anna River below Taylor's Bridge." Wet plate glass negative by Timothy O'Sullivan. View full size.
Submitted by Anonymous Tipster on Wed, 07/02/2008 - 8:04pm.
Since this was during the Civil War, it is likely they were there to see who was crossing! This area was later the site of the Battle of Fredericksburg I believe...