In order to break out of Normandy, the Allied armies developed a multi-stage operation. It started with a British and Canadian attack along the eastern battle line around Caen in Operation Goodwood on 18 July. The German Army responded by sending a large portion of its armoured reserves to defend. Then, on 25 July thousands of American bombers carpet bombed a 6,000-metre hole on the western end of the German lines around Saint-Lô in Operation Cobra, allowing the Americans to push forces through this gap in the German lines. After some initial resistance, the German forces were overwhelmed and the Americans broke through. On 1 August, Lieutenant General George S. Patton was named the commanding officer of the newly recommissioned US Third Army—which included large segments of the soldiers that had broken through the German lines—and with few German reserves behind the front line, the race was on. The Third Army quickly pushed south and then east, meeting very little German resistance. Concurrently, the British and Canadian troops pushed south (Operation Bluecoat) in an attempt to keep the German armour engaged. Under the weight of this British and Canadian attack, the Germans withdrew; the orderly withdrawal eventually collapsed due to lack of fuel.