The monument to the 13th New York Independent Battery is north of Gettysburg on Howard Avenue. (39.84255° N, 77.23295° W; Google map; Tour map: Howard Avenue West) It was dedicated by the State of New York in 1893.
The monument is fronted by the crescent moon symbol of the Union 11th Corps above the Seal of the State of New York.
The battery was commanded at the Battle of Gettysburg by Lieutenant William Wheeler. It brought 118 men to the field serving four 3″ Ordnance Rifles, and lost eight wounded and three missing.
From the monument:
13th New York Indept. Light Battery
Artillery Brigade 11th Corps.
July 1, 1863 engaged here. July 2, on Cemetery Hill.
July 3, at repulse of Pickett’s Charge.
See more about the 13th New York Independent Battery in the Civil War