The Second Boer War (Afrikaans: Tweede Vryheidsoorlog, lit. 'Second Freedom War', 11 October 1899 – 31 May 1902), also known as the Boer War, Transvaal War, Anglo–Boer War, or South African War, was a conflict fought between the British Empire and the Boer republics (the South African Republic and Orange Free State) over Britain's influence in Southern Africa.
The Witwatersrand Gold Rush caused an influx of "foreigners" (Uitlanders) to the South African Republic (SAR), mostly British from the Cape Colony. As they were permitted to vote only after 14 years residence, they protested to the British authorities in the Cape. Negotiations failed at the botched Bloemfontein Conference in June 1899. The conflict broke out in October after the British government decided to send 10,000 troops.
The war had three phases. In the first, the Boers mounted preemptive strikes into British-held territory in Natal and the Cape Colony, besieging British garrisons at Ladysmith, Mafeking, and Kimberley. The Boers won victories at Stormberg, Magersfontein, Colenso and Spion Kop. In the second phase, British fortunes changed when their commanding officer, General Redvers Buller, was replaced by Lord Roberts and Lord Kitchener, who relieved the besieged cities and invaded the Boer republics at the head of a 180,000-strong expeditionary force. The Boers, aware they were unable to resist such a force, refrained from fighting pitched battles, allowing the British to occupy both republics and their capitals. Boer politicians fled or went into hiding; the British annexed the two republics in 1900. In Britain, the Conservative ministry attempted to capitalise by calling an early general election, dubbed a "khaki election". In the third phase, Boer fighters launched a guerrilla campaign. They used hit-and-run attacks and ambushes against the British for two years.
The guerrilla campaign proved difficult for the British to defeat, due to unfamiliarity with tactics and support among civilians. British high command ordered scorched earth policies as part of a counterinsurgency campaign. Over 100,000 Boer civilians were forcibly relocated into concentration camps, where 26,000 died, by starvation and disease. Black Africans were interned to prevent them from supplying the Boers; 20,000 died. British mounted infantry were deployed to track down guerrillas, and few combatants were killed in action, most dying from disease. Kitchener offered terms to remaining Boer leaders to end the conflict. Eager to ensure Boers were released from the camps, most Boer commanders accepted the 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 colony within the British Empire.
British expeditionary efforts were aided significantly by colonial forces from the Cape Colony, the Natal, Rhodesia, and many volunteers from the British Empire. Black African recruits contributed increasingly to the British effort. International public opinion was sympathetic to the Boers and hostile to the British. Even within the UK, there existed significant opposition to the war. As a result, the Boer cause attracted volunteers from neutral countries, including the German Empire, the United States, Russia and parts of the British Empire, such as Australia and Ireland. Some consider the war the beginning of questioning the British Empire's global dominance, due to the war's surprising duration and unforeseen losses suffered by the British. A trial for British war crimes, including the killings of civilians and prisoners, was opened in January 1902. The war had a lasting effect on the region and on British domestic politics.
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