Logue and Bertie's success came to be of national importance in December 1936 when King Edward VIII suddenly abdicated and left the throne to his younger brother. Now King George VI, Bertie was required to make many speeches both in person and over the air. He never completely mastered his stammer, but his improvement, fostered by Logue and by Queen Elizabeth, enabled him to speak fluently enough to satisfy all but the most severe critics. This was critical, because King George was to lead his nation and Empire through some of its darkest times of war and economic downturn.