Alexander was later to write "It is not too much to say that the DUKW revolutionised the problem of beach maintenance." On 17 May, Alexander issued his Operation Instruction No. 1 setting out his broad plan and defining the tasks of the two armies. Broadly speaking, he intended to establish his armies along a line from Catania to Licata preparatory to a final operation to reduce the island. He later wrote that at that stage it was not practicable to plan further ahead but that his intentions were clear in his own mind what the next step would be: he would drive north ultimately to Santo Stefano on the northern coast to split the island in two and cut his enemy's east-west communications. The Seventh Army was assigned to land in the Gulf of Gela, in south-central Sicily, with the 3rd Infantry Division and 2nd Armored Division to the west at Licata Mollarella beach, 1st Division in the center at Gela, and 45th Division to the east at Scoglitti. The 82nd Airborne Division was assigned to drop behind the defences at Gela and Scoglitti. The Seventh Army's beach-front stretched over . The British Eighth Army was assigned to land in south-eastern Sicily. XXX Corps would land on either side of Cape Passero, while XIII Corps would land in the Gulf of Noto, around Avola, off to the north. The Eighth Army's beach front also stretched , and there was a gap of some between the two armies. Once the Axis forces had been defeated in Tunisia, the Allied strategic bomber force commenced attacks on the principal airfields of Sardinia, Sicily and southern Italy, industrial targets in southern Italy and the ports of Naples, Messina, Palermo and Cagliari (in Sardinia). The attacks were spread to maintain uncertainty as to the next Allied move, and to pin down Axis aircraft and keep them away from Sicily. Bombing of northern Italy (by aircraft based in the UK) and Greece (by aircraft based in the Middle East) was increased. From 3 July, bombing concentrated on Sicilian airfields and Axis communications with Italy, although beach defences were left alone, to preserve surprise as to where the landings would occur. By 10 July, only two airfields in Sicily remained fully operational and over half the Axis aircraft had been forced to leave the island. Between mid-May and the invasion, Allied airmen flew 42,227 sorties and destroyed 323 German and 105 Italian aircraft, for the loss of 250 aircraft, mostly to anti-aircraft fire over Sicily.