France outlawed the pro-independence political party, the Union of the Peoples of Cameroon (''Union des Populations du Cameroun''; UPC), on 13 July 1955. This prompted a long guerrilla war waged by the UPC and the assassination of several of the party's leaders, including Ruben Um Nyobè, Félix-Roland Moumié and Ernest Ouandie. In the British Cameroons, the question was whether to reunify with French Cameroon or join Nigeria; the British ruled out the option of independence.