 On 20 April, Hitler ordered and the "Wehrmacht" initiated "Operation Clausewitz", which called for the complete evacuation of all "Wehrmacht" and SS offices in Berlin; this essentially formalized Berlin's status as a frontline city.The forces available to Artillery General Helmuth Weidling for the city's defence included several severely depleted "Wehrmacht" and "Waffen-SS" divisions, in all about 45,000 men.These formations were supplemented by the Berlin Police force, child soldiers in the compulsory Hitler Youth, and the "Volkssturm" militia of males not already in the military.