The rottenest thing in the history of the British Empire was the Boer war.
They basically waged war with peaceful farmers on account of minerals beneath their soil.
They couldn't beat the farmers so they put their women and children in concentration camps and starved them to death until the Boer men surrendered.
Interestingly enough Canada sent 200 *NWMP to aid the British (*Now called the RCMP) and they had a lot to do with the collection of women and children for internment.