British had concentration camps in the Second Boer War 1899-1902
Interesting. I never knew this.
Boer Wars - Wikipedia, the free encyclopedia
During the later stages of the Second Boer War, the British pursued the policy of rounding up and isolating the Boer civilian population in concentration camps, one of the earliest uses of this method by modern powers. The wives and children of Boer guerrillas were sent to these camps, which had poor hygiene and little food. Many of the children in these camps died, as did some of the adults.