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　　Take a closer look inside the battleships and submarines that set naval warfare in motion, from prehistoric Viking longships to Vietnam War-era river vessels. 　　1. Viking Longships 　　2. Stealth 　　3. Doomed Vessels 　　4. Destroyers and Cruisers 　　5. Secrets of the Sea 　　6. Galleons and Privateers 　　7. The Battle of Leyte Gulf 　　8. Amphibious Assaults