The Italian fleet also took advantage of the situation and moved onto the offensive, blocking or decimating at least three large Allied convoys bound for Malta. This led to a number of naval engagements, such as the "Second Battle of Sirte", the "Battle of Mid-June" or Operation "Harpoon" (plus Operation "Vigorous") and finally to Operation "Pedestal", all of them favourable to the Axis but sufficient supplies had been delviered to Malta for it to survive as a British base. The biggest success of the Italian Fleet was the aerial and surface attack on the "Harpoon" convoy, which sank several Allied warships and damaged others. Only two transports of the original six reached Malta. This was the only undisputed squadron-size victory for Italian surface forces in World War II.