After the 1933 Nazi seizure of power, Brauchitsch was put in charge of the East Prussian Military District. He borrowed immense sums of money from Adolf Hitler and became dependent on his financial help. Brauchitsch served as Commander-in-Chief of the German Army from February 1938 to December 1941. He played a key role in the Battle of France and oversaw the German invasions of Yugoslavia and Greece. For his part in the Battle of France, he became one of twelve generals promoted to field marshal.