Bert Winschel, above left, and Paul Arnold watch during a cannon demonstration at the Vicksburg National Military Park. The park has cannon demonstrations at 10 a.m. and 2:30 p.m. Friday through Sunday until Aug. 4. They are also demonstrating the riflery at 9 a.m., 11 a.m., 1 p.m., and 3:30 p.m. on the same days as the cannon demonstrations. (The Vicksburg Post/CHAD APPLEBAUM)