This Civil War era mortar has Cyrus Alger & Co. of Boston maker markings on top of the tube and is of an unidentified pattern. Mortars such as this were small and thus readily man-portable using as few as two men and could be used from within trenches during siege operations. The bore measures approximately 4 1/4 inches at the muzzle and is approximately 15 inches deep including the chamber. The tube itself measures approximately 22 inches from muzzle to the end of the ball and 16 inches wide at the trunnions. Marked "228" between flash hole and cascabel on tube. Sitting on a concrete base.