Major Warden reported to Sir Harry Smith that the safety of the Sovereignty for the time lay in assenting to this proposal, as he could not hold it against the Basutos and the Transvaal Boers combined. The result was the appointment of Commissioners and the negotiation in 1852 of the Sand River Convention "with the Commandant and Delegates of the Boers living beyond the Vaal," by which the British Government "guaranteed to the emigrant farmers beyond the Vaal River the right to manage their own affairs and to govern themselves according to their own laws without any interference on the part of the British Government." Provisions were included by which the British authorities disclaimed all alliances with colored peoples north of the Vaal, and the Boers accepted the declaration (on paper) that "no slavery is or shall be permitted or practiced" in the country under their control. This arrangement finally severed the two communities, carried across the Vaal another migration of the anti-British element, and in time consolidated the bitterly hostile and prejudiced sections of population into the present Transvaal Republic. Meanwhile, peace had been made with the Kaffirs, and Sir George Cathcart, who was now Governor at the Cape, invaded Basutoland with a considerable force of regulars for the purpose of punishing Moshesh. As usual in South African warfare, he under-estimated the numbers and fighting skill of his opponents as well as the natural strength of this Switzerland of the Veldt. Thaba Bosigo was too hard a nut for his force to crack, and he was, besides, drawn into an ambush and defeated. Moshesh, however, was wise enough not to press his advantage too far, and with statecraft which was worthy of a greater sphere, asked and received peace on terms very beneficial to himself. [Sidenote: Changed Policy]