It can happen anywhere. Lizzie van Zyl, visited by Emily Hobhouse in a British concentration camp. The Nazis weren't the first to utilize concentration camps. This picture of Lizzie was taken during the Boer War.
Sir Arthur Conan Doyle was not present at the Battle of Paardeberg, but he was in South Africa for six months during the war as a volunteer field army surgeon, and I have used him as a character in my forthcoming novel of the battle.