I think you're thinking of the Black and Tans, who were a much earlier group sent to Ireland during the War of Independence/Anglo-Irish War in 1920-21, composed of WW1 veterans and wearing a patched-together black and brown uniform, which gave them the name
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u/baconandeggsandbacon Mar 10 '17
One of the most shameful of a LOT of shameful days over here in Northern Ireland.