As the British extended their blockade to the longer Norwegian coastline and up to Russia during the Anglo-Russian War (1807–1812), a different type of vessel became necessary. The result was the Norwegian gun-ship, a class of ten pine schooner-rigged vessels all built to the same plan. Each was equipped with 30 oars to permit their crews to row them in calm weather; all were more or less identically armed. These ships had a reputation for seaworthiness, a characteristic much needed in the waters of the Norwegian Sea that was their main area of operations.