Australia's leadership changed again during the Borneo Campaign. Prime Minister Curtin suffered a heart attack in November 1944, and Deputy Prime Minister Frank Forde acted in his place until 22 January 1945. Curtin was hospitalised with another bout of illness in April 1945, and Treasurer Ben Chifley became acting Prime Minister as Forde was attending the San Francisco Conference. Curtin died on 5 July 1945, and Forde was sworn in as Prime Minister. Forde did not have the support of his party, however, and was replaced by Chifley after a leadership ballot was held on 13 July.