Before receiving his "gift" of a Polish estate, Guderian, as Inspector General for the Panzers, had been opposed to the plans for Unternehmen Zitadelle, which was to lead to the Battle of Kursk, one of Germany's worst defeats of the war; after receiving the estate, Guderian did a 180° turn about as to the wisdom of the operation.[26] Instead of criticizing Zitadelle openly, Guderian approached Goebbels to ask him if he could talk Hitler out of it, behavior that Goda described as very atypical.[26] Guderian was well known for his brash, blunt, outspoken style, for his rudeness to those he disliked, (in a notorious incident later in 1943, Guderian refused to shake the hand of Field Marshal Kluge because as he told him to his face he was not worthy of shaking hands), and for using vulgar, profanity-ridden language to describe a plan if he believed it to be bad one.[26][27]