Blitzkrieg: attacked with speed and surprise - panzer armies
Air: ‘Bomber’ Harris and strategic Bombing – Dresden BATTLE
2nd Front – agreed at Casablanca by Churchill and Roosevelt. D Day saw a shift in the strategy as air support was vital and the complete destruction of the Luftwaffe was given the highest priority.
After the Mediterranean the Allies would advance from France and Russia to defeat Germany before swinging focus to the Far East and Japan
The Atomic bombs although effective were not part of the Grand Strategy.