Visitors to the new 5,100-square-foot gallery will be transported to the years preceding the Revolutionary War, and will travel through to the end of the Frontier Indian Wars. Among the 175 priceless artifacts now displayed are numerous muskets and rifles, a 200-pound mountain howitzer used in the Mexican-American War, a Civil War era James gun with its innovative rifling system, and the Gatling Gun — the forerunner of the modern machine gun — used in the Frontier Indian Wars.