Division commander von Boineburg-Lengsfeld, simultaneously Commandant of Greater Paris, supported military governor of France Carl-Heinrich von Stülpnagel in the anti-Hitler 20 July plot. On 20 July 1944, Stülpnagel was informed by Stauffenberg's cousin, who had received a telephone call from Stauffenberg, that Hitler was dead and that the coup was in progress. Stülpnagel then ordered the arrest of all 1,200 SS personnel in the city.