Operation Strangle - Diadem Phase

Diadem Phase

Operation Strangle achieved air superiority before the Diadem phase commenced. During Diadem, commanders continued interdicting supply lines but also conducted close air support to maintain air superiority. Some changes in target selection proved to have far-reaching effects on later military doctrine: a partial switch from rail to road targets, coupled with a concentration on the region closest to enemy lines, aimed to cripple the enemy by denying reliable transportation and reducing access to local supplies.

These efforts impaired but did not critically deplete German access to fuel and ammunition. The Germans used alternate routes and quickly repaired damaged points, especially at night and in bad weather, when the Americans could not bomb. German supply needs were low during the Operation Strangle, so in some respects they were able to maintain and even increase supplies.

The major benefit to the Allies of Operation Strangle was unintended: it reduced German troop mobility. The Germans had no reserve forces behind front lines and relied upon tactical mobility, so the inability to transfer forces quickly to weakly held points crippled their battle readiness. Three weeks after the ground campaign began, the Germans were in full retreat.