Joined by volunteers of other political stripes, the Canadian contingent known as the Mackenzie-Papineau Battalion joined the International Brigades (a coalition of volunteers from many countries) to fight for the elected leftwing government of the Second Spanish Republic against the fascist-supported insurgency of General Francisco Franco. The "Mac-Paps" fought bravely in many battles but were forced to leave Spain in 1938 by Prime Minister Juan Negrín López along with the other foreign volunteers as it became clear that the war was lost. Of the nearly 1,500 Canadians known to have fought in Spain, 721 were verified as having lost their lives.