on offensive, rather than defensive operations. In November 1940, after months of poorly coordinated Italian air strikes, the FAA and Royal Navy struck at Italian naval forces in the Battle of Taranto, a victory for sea-air power and definite proof that aircraft could wreak havoc on naval vessels without air cover. Fairey Swordfish torpedo bombers disabled a number of Italian heavy units during the battle. The withdrawal of the Italian fleet to Naples, out of reach of British aircraft, was a strategic victory which handed naval supremacy to the British for the time being. The Royal Navy's submarines also began a period of offensive operations. British U-class submarines began operations as early as June. Larger submarines also began operations, but after 50% losses per mission, they were withdrawn. U-class submarines operated from the Manoel Island Base known as . Unfortunately no bomb-proof pens were available as the building project had been scrapped before the war, owing to cost-cutting policies. The new force was named the Tenth Submarine Flotilla and was placed under Flag Officer Submarines, Admiral Max Horton, who appointed Commander G.W.G. Simpson to command the unit. Administratively, the Tenth Flotilla operated under the First Submarine Flotilla at Alexandria, itself under Cunningham. In reality, Cunningham gave Simpson and his unit a free hand. Until U-class vessels could be made available in numbers, British T-class submarines were used. They had some successes, but suffered heavy losses when they began operations on 20 September 1940. Owing to a shortage of torpedoes, enemy ships could not be attacked unless the target in question was a warship, tanker or other "significant vessel". The performance of the fleet was mixed at first. They sank of Italian shipping, half of which was claimed by one vessel, . It accounted for one Italian submarine, nine merchant vessels and one motor torpedo boat (MTB). The loss of nine submarines and their trained crews and commanders was serious. Most of the losses were due to mines. On 14 January 1941, U-class submarines arrived, and the submarine offensive began in earnest. Luftwaffe arrives (January–April 1941) German intervention German intervention over Malta was more a result of the Italian defeats in North Africa than Italian failures to deal with the island. Hitler had little choice other than to rescue his Italian ally or lose the chance of taking the Middle Eastern oilfields in Arabia. The Deutsche Afrika Korps (DAK or Africa