Having failed to defeat the RAF, the "Luftwaffe" adopted a different and clearer strategy of strategic bombing known as The "Blitz". However, as with the campaign against the RAF, the types of targets differed radically and no sustained pressure was put under any one type of British target. Disputes among the OKL staff revolved more around tactics than strategy. This method condemned the offensive over Britain to failure before it had even begun. The end result of the air campaign against Britain in 1940 and 1941 was a decisive failure to end the war. As Hitler committed Germany to ever increasing military adventures, the "Wehrmacht" became increasingly overstretched and was unable to cope with a multi-front war. By 1944, the Allies were ready to launch Operation Overlord, the invasion of Western Europe. The Battle of Britain ensured that the Western Allies had a base from which to launch the campaign and that there would be a Western Allied presence on the battlefield to meet the Soviet Red Army in central Europe at the end of the war in May 1945.