Ka cika wannan magana: Mutane da yawa sun zo daga Faransa (10,000), Nazi na Jamus da Austria (5,000), da kuma Italiya (3,350). Fiye da 1000 kowannensu ya zo daga Tarayyar Soviet, Amurka, United Kingdom, Poland, Yugoslavia, Czechoslovakia, Hungary da Kanada. Thälmann Battalion, wani rukuni na Jamusawa, da Garibaldi Battalion, wani rukuni na Italiya, sun bambanta ƙungiyoyin su a lokacin yakin basasa.
Kewaye da Madrid. Amurkawa sun yi yaƙi a cikin raka'a kamar XV International Brigade ("Abraham Lincoln Brigade"), yayin da 'yan Kanada suka shiga cikin Mackenzie <unk> Papineau Battalion.