Caption: The Ellsworth Zouaves Routing the Black Horse Cavalry. Sketched on the spot by Wilbur F. Osler. See page 218 [for related story].
Source: Illustration from New York Illustrated News, August 5, 1861, page 220.
The 11th New York Volunteer Infantry Regiment was known as the Fire Zouaves or the Ellsworth Zouaves. More about the Zouaves.
Note: An illustration of this event also appeared in Harper's Weekly on August 10, 1861.