The monument to the 1st New York Independent Battery is south of Gettysburg on Hancock Avenue at the Copse of Trees. (39.812348° N, 77.235625° W; Google map; Tour map: Hancock Avenue Pt. 3) It was dedicated in 1887 by the State of New York.
The battery was commanded at the Battle of Gettysburg by Captain Andrew Cowan. It brought 113 men to the field serving six Ordnance Rifles, and suffered four killed and eight wounded.
From the north side of the monument:
Double canister at ten yards.
July 3rd 1863.
Cowans First New York Battery
Artillery Brigade – Sixth Corps.
From the south side of the monument:
Erected in memory of our comrades, July 3rd, 1887.
“The world can never forget what they did here.”
During the cannonade preceding Longstreet’s assault, the battery was engaged a sort distance farther to the left, but by order of General Webb, it moved at a gallop to this position, which Battery B, 1st R.I. Artillery had occupied. Skirmishing had just commenced. The Confederate lines were over the defenses and within ten yards of our guns. Our loss was four men and fourteen horses killed, two lieutenants and six men wounded. The battery was relieved on the morning of July 5th, and returned to the Sixth Corps.
See more on the 1st New York Independent Battery in the Civil War