Large numbers of Xhosa were displaced across the Keiskamma by Governor Harry Smith, and these refugees supplemented the original inhabitants there, causing overpopulation and hardship. Those Xhosa who remained in the colony were moved to towns and encouraged to adopt European lifestyles. In June 1850 there followed an unusually cold winter, together with an extreme drought. It was at this time that Smith ordered the displacement of large numbers of Xhosa squatters from the Kat River region. The war became known as "Mlanjeni's War", the eighth war, after the prophet Mlanjeni who arose among the homeless Xhosa and preached mobilization, large numbers of Xhosa began leaving the colony's towns and mobilizing in the tribal areas. In February 1852, the British Government decided that Sir Harry Smith's inept rule had been responsible for much of the violence, and ordered him replaced by George Cathcart, who took charge in March. In February 1853 Xhosa chiefs surrendered, the 8th frontier war was the most bitter and brutal in the series of Xhosa wars. It lasted over two years and ended in subjugation of the Ciskei Xhosa.