Union soldier Peter Hanley/gravesite

I have found the grave of a Peter Hanley born 1834 died at Trinity Church Abbeville, SCarolina, the church was being used as a hospital for wounded and most died there.there are five Alabama Confederates died and buried in row and the Union Soldier, Peter Hanley is buried alone a distance away from all Confederate soldiers in the Trinity Church Cemetery with marker showing his rank and his unit and dates born 1834 died 1865..
Does anyone know anything about him, he was in a New York company...
thanks
Patricia Trussell-Mann