The Italian fleet went on the offensive, blocking or mauling three large Allied convoys bound for Malta. This led to a number of naval engagements, including the Second Battle of Sirte in March 1942, Operation Harpoon and Operation Vigorous, (known as the "Battle of Mid-June") and Operation Pedestal (the "Battle of Mid-August"). All of these engagements ended favourably for the Axis. Despite this activity, the only real success of the Italian fleet was the surface attack on the Harpoon convoy, supported by Axis aerial forces. These attacks sank several Allied warships and damaged others. Only two transports of the original six in the convoy reached Malta. This was the only undisputed squadron-sized victory for Italian surface forces in World War II.