Kammala jumla mai zuwa: Da farko ya umurci Kirista Colonel Lufti Jabar, wanda a baya ya kasance a haɗe da Ƙungiyar Ƙungiyar Larabawa ta Siriya, babban aikin Brigade na shida a lokacin yakin
Yaƙin Mountain ya kasance don kiyaye tsari da tsaro a Yammacin Beirut. Bayan da Brigade ta rabu da tsarin umarnin Sojoji a ranar 6 ga Fabrairu, 1984, wani sabon jami'i ya karbe shi, Kanar Shi'a (daga baya, Manjo Janar) Abd al-Halim Kanj; wadancan jami'an Kirista da mazajen da suka kasance masu biyayya ga Gwamnatin Lebanon sun bar Brigade kuma an kwashe su a karkashin 'yan bindigar Amal zuwa Gabashin Beirut, inda suka shiga cikin sauran rukunin Sojojin da Kiristocin ke sarrafawa. A ranar 24 ga Yuli, 1984, Brigade na shida ya shiga tsakani don dakile fada a Yammacin Beirut tsakanin 'yan bindigar Sunni Al-Mourabitoun da Druze People's Liberation Army (PLA).