Built by General Motors, Canada, based on a construction of the British Humber armoured car Mk III, adapted to a Canadian Military Pattern truck (CMP) chassis.

[a] The four man crew consisted of the vehicle commander, the driver, a gunner and a wireless operator.

Among its users was Polish 15th Pułk Ułanów Poznańskich ("Poznań Uhlans Regiment"), fighting in Italy in 1943–1944.

[1] After the Second World War many of them went to the Portuguese Army, which used them from 1961 to 1975 in counterinsurgency in Angola, Guinea and Mozambique.

The resulting hybrid vehicle, called "Humfox", was immediately successful and popular[citation needed], and some were passed to the Indonesian Army after independence.