High Quality Content by WIKIPEDIA articles! A frigate is a warship. The term has been used for warships of many sizes and roles over the past few centuries. In the 17th century, the term was used for any warship built for speed and maneuverability, the description often used being "frigate-built". These could be warships carrying their principal battery of carriage-mounted guns on a single deck or on two decks (with further smaller carriage-mounted guns usually carried on the forecastle and quarterdeck of the vessel). The term was generally used for ships too small to stand in the line of battle, although early line-of-battle ships were frequently referred to as frigates when they were built for speed. In the 18th century, the term referred to ships which were usually as long as a ship-of-the-line and were square-rigged on all three masts (full rigged), but were faster and with lighter armament, used for patrolling and escort. In the definition adopted by the British Admiralty, they were Rated ships of at least 28 guns, carrying their principal armament upon a single continuous deck - the upper deck, while ships-of-the-line possessed two or more continuous decks bearing batteries of guns.