 On 21 March, Army Group H headquarters became "Oberbefehlshaber Nordwest" ("Army Command Northwest") commanded by Ernst Busch leaving the former Army Group H commander—Johannes Blaskowitz—to lead "Army Command Netherlands" (25th Army) cut off in the Netherlands.Busch—whose main unit was the German 1st Parachute Army —was to form the right-wing of the German defenses.In the center of the front, defending the Ruhr, Kesselring had Field Marshal Walther Model commanding Army Group B (15th Army and 5th Panzer Army) and in the south Paul Hausser's Army Group G (7th Army, 1st Army and 19th Army).