Statistics for occurrence #1 of “Mercersburg, Pa.” in chapter 30, regiment NY1LtArtillery of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

...anna, to November, 1864. District of Philadelphia, Dept. of Pennsylvania, to June, 1865. Duty at Philadelphia, Harrisburg, Chambersburg and Allegheny City, Pa., June, 1863, to June, 1865. Mercersburg, Pa. , July 29, 1864 (Section). Mustered out June 28, 1865. Battery lost during service 4 Enlisted men killed and mortally wounded and 9 Enlisted men by disease. Total 13.
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