When Churchill was a POW (4,3)

I believe the answer is:

boer war

(Other definitions for boer war that I've seen before include "Conflict in southern Africa" , "Fighting" , "'One of two armed conflicts in southern Africa (4,3)'" , "Either of two conflicts fought by Britain in S Africa" , "Rare bow (anag)" .)

I've seen this clue in the Newsday.

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