Manasirah moved to Beirut to join the Palestinian revolution. He volunteered in the ranks of the military resistance in parallel with his work in the Palestinian cultural field and the cultural resistance as an independent, as well as within the institutions of the revolution, as a cultural editor of the Palestine Revolution-speaking magazine Palestine, in addition to serving as editorial secretary of the Palestinian Affairs Journal of the Palestinian Research Centre in Beirut. He was elected as a member of the Joint Palestinian-Lebanese Forces Military Command in the area south of Beirut during the beginning of the 1976 Lebanese Civil War. He was assigned by Yasser Arafat to run a school for the sons and daughters of the Tel Zaater camp after the residents of the camp were displaced to the Lebanese village of Damour. During the Israeli invasion of Lebanon and the siege of Beirut, he served as editor-in-chief of the "Journal of Battle" (published during the siege of Beirut).