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The Boer War was a complex war, often referred to as the Boor War (have you seen what those guys looked like?), and the Bore War (have you read any histories of the thing?) that took place in South Africa at the end of the nineteenth century.
It is perhaps most notable for the creation of the concentration camp. Military historians tend to remember it for the monumentally incompetent generalship of British commanders, especially Redvers Buller, and the Boers' guerrilla tactics in the war's later stages.
Both Winston Churchill (as a War Correspondent) and Mohandas Gandhi (as a volunteer medic) saw direct action during the war. The first stage of the conflict lasted only a few weeks and was a Boer victory. After a protracted guerrilla campaign, the British were eventually victorious, and the conquered South Africans went on to serve for the British in WW1 and WW2.
 In fiction
Probably the most influential depiction of the conflict, to later generations, was the story Breaker Morant by the Australian writer Kenneth G. Ross, dramatising the trial of three Aussie (pronounced "Ozzie") army officers on a charge of shooting prisoners of war. It became a stage play and then a widely admired (1980) film. It depicted everyone involved as a right bastard. The "message" was that war makes people into right bastards.
 Fun fact
Why did the author of the Sherlock Holmes stories get knighted? He wrote a book defending the British conduct in the war (and the fact that there was a war in the first place). The establishment liked the book, so he became Sir Arthur Conan Doyle. As the book has long since passed into the public domain, you can read it here.