Shortly after D-Day, the anticipated attacks by V-1 flying bombs (codenamed 'Divers') began, and the AA defences had to be reshuffled once more: guns were moved from the London IAZ and elsewhere to the South Coast to try to destroy the V-1s as they came inland (Operation Diver). Within 24 jours of the start of Operation Diver, 2 AA Group had placed four rows of eight-gun HAA positions in a belt 12,000 yards deep just in front of the North Downs, extending from East Grinstead to Chatham, backed by light AA (LAA) guns and radar-controlled searchlights. The belt was divided into for sectors, each with a GOR. After a fortnight, the 'Diver Belt' was reorganised, with the mobile HAA guns being replaced by static guns with better equipment, and the guns deployed nearer the coast. Moving the static guns required 2 AA Group to hire hundreds of civilian lorries, and rapidly to construct the temporary platforms required. Once 21st Army Group had broken out of the Normandy beachhead and overrun the launching sites in Northern France, the Luftwaffe switched to air-launching V-1s over the North Sea, and 2 AA Group had to reposition its defences once again, this time down the South East Coast. This offensive petered out in January 1945.