 Although hostile to the Guard's new leader, Horia Sima, he became involved in the January 1941 confrontation between Sima's Legionnaires and Ion Antonescu.In early 1941, the conflict for power turned into an Iron Guard-led failed rebellion and a pogrom against the Jewish population in Bucharest where over one hundred Jews and Romanians were massacred.Known as the Legionnaires' Rebellion, the event was partly motivated by the killing of a German Reich resident and local Abwehr chief, Major Döring — which was probably accomplished with assistance from the British Intelligence Service.