Share This Article 1. On 7 April 1862 this Confederate stronghold on the Mississippi surrendered. Cairo, Illinois Vicksburg, Mississippi Island No. 10 Fort Donelson 2. This country’s general staff was the first to use the “staff ride” as a training exercise. Austria Germany Great Britain France 3. The Area-51 facility was established in 1955 to develop this aircraft. The SR-71 The F-111 The U-2 The F-117 Loading …
