The Fourth Hughes Ministry was the fifteenth Australian Commonwealth ministry, and ran from 5 May 1917 to 3 February 1920. Nationalist Party of Australia * Rt Hon Billy Hughes, KC MP: Prime Minister, Attorney-General * Rt Hon Joseph Cook, MP: Minister for the Navy * Rt Hon Sir John Forrest, GCMG MP: Treasurer (to 27 March 1918) * Senator Hon George Pearce: Minister for Defence * Hon William Watt, MP: Minister for Works and Railways (to 27 March 1918), Treasurer (from 27 March 1918), Minister for Trade and Customs (13 December 1918 to 17 January 1919), Acting Prime Minister in Mr. Hughes' absence (April 1918-August 1919) * Hon Paddy Glynn, KC MP: Minister for Home and Territories * Hon Jens Jensen, MP: Minister for Trade and Customs (to 13 December 1918) * Hon William Webster, MP: