Warships are armed naval fighting ships that range from small vessels to giant ships. The earliest known warships--called galleys by the Egyptians and Greeks--sailed nearly 3,000 years ago. They were long open warships that used square shaped sails and 40-foot (12.2 m) oars to move through the water. Extended from the ship's bow was a long sharp point for ramming enemy ships. Shields made of animal hide or other material covered the sides to protect the slaves who manned the oars. The Assyrians, Greeks, and Romans (who developed three-tiered versions called triremes) used these vessels successfully in their battles.

In the Middle Ages the Vikings developed the drakkar, or long boat. These ships had a tall stern and bow and their sides were protected by shields. They were not only much lighter than the galleys, but were also stronger and more maneuverable. By 1000 a.d., the drakkars ruled their part...