In 1940, the Italian Royal Navy ("Regia Marina") could not match the overall strength of the British Royal Navy in the Mediterranean Sea. After some initial setbacks, the Italian Navy declined to engage in a confrontation of capital ships. Since the British Navy had as a principal task the supply and protection of convoys supplying Britain's outposts in the Mediterranean, the mere continued existence of the Italian fleet (the so-called "fleet in being" concept) caused problems for Britain, which had to use warships sorely needed elsewhere to protect Mediterranean convoys. On 11 November, Britain launched the first carrier strike of the war, using a squadron of Fairey Swordfish torpedo bombers to attack Taranto. The raid left three Italian battleships crippled or destroyed for the loss of two British aircraft shot down.