Scarred by the experiences of World War I, Australia reluctantly prepared for a new war, in which the primacy of the British Royal Navy would indeed prove insufficient to defend Australia from attack from the north. Billy Hughes was brought back into cabinet by Lyons as Minister for External Affairs in 1937. From 1938, Lyons used Hughes to head a recruitment drive for the Australian Defence Force. Prime Minister Lyons died in office in April 1939, with Australia just months from war, and the United Australia Party selected Robert Menzies as its new leader. Fearing Japanese intentions in the Pacific, Menzies established independent embassies in Tokyo and Washington to receive independent advice about developments.