On April 13, 1975, it witnessed the serious church shooting and Bus Massacre, between the local Christian Kataeb party and the Arab Liberation Front militants and Palestinians, which sparked the 15-year-long civil war.
[6] During the Civil War, it became a war-torn neighbourhood[7][8][9] and an important stronghold of the Christian militias, like the Lebanese Forces,[10] Kataeb, Ahrar,[11] Herras, etc., and witnessed violent battles, either with the Muslims across the Green Line with Chyah of the "West Beirut" on its border, the Syrian Forces, Palestinians and even inter-Christian conflicts,[12][13] and was known for its endurance, thus became known as the "fortress of resistance" (قلعة الصمود).
[14] In February 1990 General Aoun launched an unsuccessful campaign to dislodge Samir Geagea’s Lebanese Forces (LF) from East Beirut.
[15] On April 13, 1975, a bus passing through Ain Al-Remmaneh, transporting Arab Liberation Front guerilla fighters and Palestinians returning from a festival, heading to their camp in Tel al-Zaatar, was gunned down by militiamen of the Kataeb party, killing all the 27 passengers except the driver, which marked the start of the Lebanese Civil War.
[8][9][16] The incident happened just hours after 4 Christians were killed outside a nearby church[8] during a child's baptism in Ain El-Remmaneh in an assassination attempt of the Phalangist (Kataeb) leader Pierre Gemayel.