The photographer , Henry P. Moore , of Concord , N.H. , was focusing on the well - uniformed Union soldiers of the 48th New York State Volunteer Infantry .
Henry P. Moore also captured soldiers ' baseball - playing comrades in the background .
The photographer , Henry P. Moore , of Concord , N.H. , was focusing on the well - uniformed Union soldiers of the 48th New York State Volunteer Infantry , but he also captured their baseball - playing comrades in the background .