Ƙarin bayani game da wannan sakin layi - Mutane da yawa da suka ba da kansu sun zo daga Faransa (10,000), Nazi 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. Battalion Thälmann, ƙungiyar Jamusawa, da Garibaldi Battalion, ƙungiyar Italiya, sun bambanta ƙungiyoyin su a lokacin Siege na Madrid
Ka yi haƙuri. 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.