Course of the War:
The Boers invaded Natal and Cape Colony; Ladysmith, Mafeking, and Kimberley were invested. British defeats at Magersfontein, Stormberg, and Colenso (December 1899) led to Lord Roberts being sent out to supersede General Buller. Kimberley and Ladysmith were relieved, Bloemfontein fell. In May 1900 Mafeking was relieved, and in June Johannesburg and Pretoria were occupied. The attempt to insist on unconditional surrender prolonged the war for two more years.