Likewise, Jäckel used Himmler's Posen speeches of 1943 and certain other statements on his part in 1944 referring to an "order" from an unnamed higher authority as proof that Hitler had ordered the Holocaust. In the same way, Jäckel used Hitler's order of 13 March 1941, ordering that the "Einsatzgruppen" be reestablished for Operation Barbarossa, as proof of the Führer's involvement in the Holocaust. Jäckel also cited the entry in Joseph Goebbels's diary on 27 March 1942 – mentioning that the Führer's "prophecy" of 1939 was coming true – as a sign that Hitler had ordered the Holocaust, and accused Irving of dishonesty in claiming that there was no sign in the Goebbels's diary that Hitler knew of the Holocaust. Finally, Jäckel noted the frequent references to the "prophecy" in Hitler's wartime speeches as a sign that Hitler had ordered the Holocaust, thereby disproving Irving's claim that Hitler was ignorant of the "Final Solution".