used up. On 1 September, Rommel was forced to retreat. Kesselring handed over Luftwaffe fuel, but this merely denied the German air units the means to protect the ground forces, thereby increasing the effectiveness of British air superiority over the frontline. In August, Malta's strike forces had contributed to the Axis' difficulties in trying to force an advance into Egypt. In that month, 33% of supplies and 41% of fuel were lost. In September 1942, Rommel received only 24% of the 50,000 tons of supplies needed monthly to continue offensive operations. During September, the Allies sank 33,939 tons of shipping at sea. Many of these supplies had to be brought in via Tripoli, many kilometres behind the battle front. The lack of food and water caused a sickness rate of 10% among Axis soldiers. The British air-submarine offensive ensured no fuel reached North Africa in the first week of October 1942. Two fuel-carrying ships were sunk, and another lost its cargo despite the crew managing to salvage the ship. As the British offensive at El Alamein began on 23 October 1942, Ultra intelligence was gaining a clear picture of the desperate Axis fuel situation. On 25 October, three tankers and one cargo ship carrying fuel and ammunition were sent under heavy air and sea escort, and were likely to be the last ships to reach Rommel while he was at El Alamein. Ultra intelligence intercepted the planned convoy route, and alerted Malta's air units. The three fuel-carrying vessels were sunk by 28 October. It cost the British one Beaufighter, two Beauforts, three (out of six) Blenheims and one Wellington. Rommel lost 44% of his supplies on October, a jump from the 20% lost in September. Siege lifted By August 1942, 163 Spitfires were on hand to defend Malta; 120 were serviceable. On 11 and 17 August and 24 October 1942, under the respective actions, Operation Bellows, Operation Baritone and Operation Train, HMS Furious brought another 85 Spitfires to Malta. Often, the Spitfires were asked to undertake flights of five and a half hours; this was achieved using 170-gallon ferry tanks. The ferry tanks, combined with a 29-gallon tank in the rear fuselage, brought the total tank capacity up to 284 gallons. Despite the success of Allied convoys in getting through, the month was as bad as any other, combining bombing with food shortages. In response to the threat Malta was