Trekboers from the Cape Colony arrived on the western borders of Basutoland and claimed rights to its land, the first of which being Jan de Winnaar, who settled in the Matlakeng area in May–June 1838. Incoming Boers attempted to colonise the land between the two rivers and even north of the Caledon, claiming that it had been abandoned by the Sotho people. Moshoeshoe subsequently signed a treaty with the British Governor of the Cape Colony, Sir George Thomas Napier, that annexed the Orange River Sovereignty where many Boers had settled. These outraged Boers were suppressed in a brief skirmish in 1848. In 1851, a British force was defeated by the Basotho army at Kolonyama, provoking an embarrassing war for the British. After repelling another British attack in 1852, Moshoeshoe sent an appeal to the British commander that settled the dispute diplomatically, and then defeated the Batlokoa in 1853.