

(Courtesy New York State Division of Military and Naval Affairs)
Flank marker, likely used by one of two artillery companies originally attached to the Tenth Legion. These artillery companies, along with two companies of cavalry, were detached from the 56th New York while the regiment was in Washington. They later became the 7th and 8th New York Independent batteries.

New York State Division of Military and Naval Affairs
This Tenth Legion Artillery flank marker is clearly marked "7 BATTERY."