The Washington arsenal yard.This type of piece was used extensively during the war, and was usually made of bronze. Its exterior was characterized by the entire absence of ornament, and was easily distinguished from the older types of field-guns. The weight of the piece was 1,200 pounds. It fired a twelve-pound projectile, also case-shot and canister. The charge for solid projectiles and case was two and a half pounds of powder; for canister, two pounds. This gun had as long range and as accurate as any of the heavier guns of the older models, while the strain of the recoil on the carriage was not nearly so heavy as in the older guns. This yard was always kept in immaculate order.