Two original captions: "Scott Martin, 3 1/2 years, checks out the barrel of a cannon on display at Jefferson Barracks for a demonstration of Civil War artillery." "Union and Confederate replica cannons, above, were fired during a Civil War program Saturday at Jefferson Barracks. Clarence Landgraf, left, wears a corporal's uniform from the Union Army. Scott Martin, 3 1/2, below, checks out the barrel of a cannon."