A close-up of a civil war cannon on the Gettysburg battlefield. Selective focus. america, american, antique, artillery, battle, battlefield, cannon, civil, civil war, confederate, conflict, culture, equipment, field, fight, fighting, gettysburg, grass, gun, heritage, historic, historical, history, howitzer, machinery, memorial, military, monument, national, natural, north, old, pa, park, patriotism, pennsylvania, preserve, rebel, shooting, south, summer, tour, travel, union, usa, vintage, war, weapon