and five pilots were lost. On 1 March, the Luftwaffe attacks on airfields destroyed all of the Wellingtons brought in in October. Royal Navy warships and Sunderland flying boats could not use the island for offensive operations, and the main fighter squadrons, Nos. 261 and 274, were put under severe pressure. There were several raids per day and over 107 Axis attacks took place in February and 105 in March, with Bf 109 fighters strafing any signs of movement on the ground. By February around 14,600 men, of the island's work force, had volunteered, rationing began reducing morale even more. and all males from ages 16 to 56 were conscripted to join the volunteers, the Royal Malta Artillery guarding Grand Harbour. The Allies had a success in April, with victory in the Battle of the Tarigo Convoy. Allied surface forces managed to sink only one small Axis convoy in daylight hours during the whole North African Campaign but on the night of 15/16 April, Axis ships were intercepted by Commander P. J. Mack's 14th Destroyer Flotilla, comprising , , Mohawk, Juno and Nubian. The destroyers sank Sabaudia (1,500 tons), Aegina (2,447 tons), Adana (4,205 tons), Isetlhon (3,704 tons) and Arta. The Italian destroyers Tarigo, Lampo and Baleno were sunk for the loss of Mohawk. The flotilla had been officially formed on 8 April 1941, in response to the need for a Malta Strike Force. This formation was to interdict Axis convoys. Commander Lord Louis Mountbatten's 5th Destroyer Flotilla was later ordered to merge with Mack's fleet to increase its striking power. The destroyers , , , , and were a part of Mountbatten's fleet. The cruisers and Gloucester accompanied the ships as part of the force. The strike force had considerable success, which justified basing it at Malta despite the danger from air attack. On 21 May, the force was sent to join the Battle of Crete. It was several months before the depleted strike force returned. Further success was had by the Malta Convoys. An urgent supply convoy from Gibraltar to Alexandria (Operation Tiger) coincided with reinforcements for the Mediterranean Fleet, two small convoys from Egypt to Malta and 48 more Hurricanes flew off HMS Ark Royal and in Operation Splice, with only the loss of the SS Empire Song, which hit a mine and sank with 10 Hurricane fighters and 57 tanks on board. Convoy Tiger transported 295