Fortress, Modern Warfare, Napoleonic, Naval Warfare, Vietnam War, World War 2

American Defenses of Corregidor and Manila Bay 1898–1945, The Atlantic Wall (1), The Berlin Wall and the Intra-German Border 1961-89, British Home Defences 1940–45, The Channel Islands 1941–45, Defending Space, Defenses of Pearl Harbor and Oahu 1907–50, Fortresses of the Peninsular War 1808–14, German Defences in Italy in World War II, Germany's West Wall, Soviet Field Fortifications 1941–45, Special Forces Camps in Vietnam 1961–70, US Strategic and Defensive Missile Systems 1950–2004, Viet Cong and NVA Tunnels and Fortifications of the Vietnam War