The "Regia Marina" and the Royal Navy engaged in a two-and-a-half-year struggle for control of the Mediterranean. The "Regia Marina"s primary goal was to support the Axis forces in North Africa while obstructing the supply route to Alexandria and cutting off supplies to Malta. The Royal Navy's major effort was to maintain supply to the military forces and people of Malta, and secondarily to interdict convoy shipments to North Africa. The first major action occurred on 11 November 1940 when the British aircraft carrier launched two waves of Swordfish torpedo-bombers in a surprise raid against the Italian Fleet moored at the naval base of Taranto. The raid came in undetected, and three battleships were sunk. Another major defeat was inflicted on the "Regia Marina" at Cape Matapan, where the Royal Navy and the Royal Australian Navy intercepted and destroyed three heavy cruisers (, and ; all of the same class) and two s in a night ambush, with the loss of over 2,300 seamen. The Allies had Ultra intercepts, which uncovered the Italian movements, and radar, which enabled them to locate the ships and range their weapons at distance and at night. The better air reconnaissance skills of the Royal Navy's Fleet Air Arm and their close collaboration with surface units were other major causes of the Italian debacle.