structural:expansion
The guerrilla campaign proved difficult for the British to defeat, due to unfamiliarity with guerrilla tactics and extensive support for the guerrillas among civilians. In response to failures to defeat the guerrillas, British high command ordered scorched earth policies as part of a large scale and multi-pronged counterinsurgency campaign; a network of nets, blockhouses, strongpoints and barbed wire fences was constructed, virtually partitioning the occupied republics. Over 100,000 Boer civilians, mostly women and children, were forcibly relocated into concentration camps, where 26,000 died, mostly by starvation and disease. Black Africans were interned in concentration camps to prevent them from supplying the Boers; 20,000 died. British mounted infantry were deployed to track down guerrillas, leading to small-scale skirmishes. Few combatants on either side were killed in action, with most casualties dying from disease. Kitchener offered generous terms of surrender to remaining Boer leaders to end the conflict. Eager to ensure fellow Boers were released from the camps, most Boer commanders accepted the British terms in the Treaty of Vereeniging, surrendering in May 1902. The former republics were transformed into the British colonies of the Transvaal and Orange River, and in 1910 were merged with the Natal and Cape Colonies to form the Union of South Africa, a self-governing dominion within the British Empire.