 It would negate the static defences of the trench and machine gun and restore the strategic principles of manoeuvre and offense.Nevertheless, it was the British Army which was the only one truly mechanised at the beginning of the Second World War, the Germans still relying on horse traction for a large portion of their artillery.The innovative German Major (later General) Heinz Guderian developed the motorised part of this strategy as the head of one of the Truppenamt groups and may have incorporated Fuller's and Liddell Hart's ideas to amplify the groundbreaking Blitzkrieg effect that was seen used by Germany against Poland in 1939 and later against France in 1940.