In April 1939 , the leader of the Country Party 's senior Coalition partner the United Australia Party , Prime Minister Joseph Lyons , died .
The leader of the Country Party , Earle Page , became caretaker Prime Minister .
In April 1939 , the leader of the Country Party 's senior Coalition partner the United Australia Party , Prime Minister Joseph Lyons , died , and the leader of the Country Party , Earle Page , became caretaker Prime Minister .