第二艦隊
Macarthur sailed on the [[Neptune (1780 ship)|"Neptune"]] in the [[Second Fleet (Australia)|Second Fleet]], the 'worst ship in the worst of Australian fleets'. Before the "Neptune" had even departed the British Isles, Macarthur became involved in disputations with various personnel, including fighting a duel with Captain Gilbert, the Master of the "Neptune". The cramped and squalid accommodation provided for his wife and infant son on board the "Neptune" provoked further disputes.