William H. Warren, History of the Seventeenth Connecticut Volunteers, Vol. III, p. 727 (typewritten):

Company G.

When this company went into the Gettysburg fight they numbered about 60 men, when they left the battlefield they numbered but 7. At the evening roll call on July 1st, only 3 answered to their names, James C. Mayne, Hiram C. Gorham, and Charles Smith, in command.