Concentration camps were used very effectively by the British against the Boers (farmers) in South Africa at the turn of the previous century. They killed more women and children than men on both sides [1].

During the first World War, they renamed New Berlin to Kitchener here in Canada. They may as well have named it Hitlerville. The scale of evil wasn't as horrible as the Holocaust, but it was pretty damn awful. It's true what they say, that the victors write the history books. So few people know about that story.

[1] https://en.wikipedia.org/wiki/British_concentration_camps