A full-rigged three-masted single-decker battleship was called a frigate. The frigate was distinguished from other sailing ships by her small dimensions and gunnery. She was intended for a long range reconnaissance and cruise services i.e., for self fighting actions at sea and ocean communications with the aim to capture and destroy enemy's merchant ships. The most larger of them had up to 60 guns, they were included at a fighting line and were called as line frigates.
In 1805 the rate of 44-gun frigates was established in Russia. The Russian 44-gun frigates were built with a flush afore and aft deck as compared with those of the 18-th century when the bow and the stern were closed and the middle part of the upper deck remained open. The famous frigate "Aurora", who took part in defense of Petropavlovsk-Kamchatka in 1854, was in the number of these frigates. She was built in 1833-1835 in St. Petersburg at the Okhta shipyard.