The British turned their attention to conquering the southern colonies beginning in 1778, believing they had more support there. For three years they marched through the south without major defeat. In 1780 General Benedict Arnold betrayed the colonists and joined the British. The colonists then scored two victories in South Carolina, defeating the British at King's Mountain in October 1780 and winning at Cowpens in January 1781. Both enslaved and free African Americans fought for the colonial side despite an order discharging them, with some also fighting for the British who offered freedom. Women contributed by managing farms and businesses and serving as nurses, cooks, and spies during the war.