Rubuta ci gaba don wannan sakin layi - A cikin 1970, yaƙi ya ɓarke tsakanin gwamnatin Jordan da ke ƙarƙashin Sarki Hussein da PLO da Yasser Arafat ke jagoranta. Wannan rikici ya zama sananne a matsayin "Black Satumba
", kuma ya haifar da tserewar sojojin Jordan da yawa na zuriyar Falasdinawa. Mahmoud na daya daga cikin wadanda suka goyi bayan kungiyar PLO, kuma suka tsere a Jerash. An nada shi mataimakin kwamandan da ake kira "Sojojin Yarmouk" na PLO. Yin aiki a ƙarƙashin Saad Sayel, saboda haka ya yi yaƙi da tsoffin abokan aikinsa a cikin Rundunar Sojan Jordan. An kayar da PLO, kuma an fitar da shi daga Jordan a tsakiyar 1971. Mahmoud ya koma Siriya, inda ya halarci taron Fatah na uku a Hamouriyah a watan Satumbar 1971. An nada shi memba na Majalisar Juyin Juya Halin Fatah a yayin wannan taron, kuma ya zama kwamandan Sojojin Yarmouk a shekarar 1972. A sakamakon haka ya karbi umarnin sojojin PLO da ke zaune a Dutsen Lebanon da kwarin Beqaa. A matsayinsa na gogaggen injiniyan soja, shi ne ke da alhakin gina katanga ga mayakan Falasdinawa.