Dates differ between historians: 16 January (Ménargues), 18 January (de Clerck and Malsagne; consistent with Fisk), 19 January (Hanf), 20 or 22 January (Traboulsi). Maslakh, next door, fell at the same time. Most of the district's people were Shi'is, living alongside Palestinians, Kurds and Armenian Lebanese. Haugbolle estimates 150-500 dead, de Clerck and Malsagne 600-1,000; some 30,000 people were driven out to West Beirut and the southern suburbs.

The siege of Damour had begun on 9 January, before the fall of Karantina; the main massacre began on 20 January (Hanf, Ménargues, Fisk, de Clerck and Malsagne; Traboulsi gives 22 or 24 January). Jiyeh fell the same day. The attackers were mainly PLA, Saiqa and Fatah units, with Lebanese leftist parties. Estimates of the dead range from about 150 bodies found plus 200 missing (Fisk) and 300-584 (de Clerck and Malsagne) to about 900 (Ménargues); some 5,000 people fled by land and sea.

Barely a tenth of American and British residents accepted the evacuation, Fisk writes. The British went by road, the PLO escorting them through West Beirut and a Libyan officer on to the Syrian lines; a day later a US landing craft took evacuees off from a PLO-guarded bathing club on the Corniche.

Israel, Hanf notes, would accept no Arab troops south of the 'red line', Syrian ones least of all. When a Syrian unit entered Nabatiyeh in January 1977, an Israeli protest got it withdrawn and the Palestinians kept the town.

Robert Fisk, who reported from the area, saw Israeli tanks on Lebanese soil near Ibl al-Saqi and Israeli shelling of Christian villages such as Rachaya al-Fukhar, where Palestinian guerrillas had dug in.

De Clerck and Malsagne and Picard agree that Haddad declared his 'State of Free Lebanon' at Marjayoun on 18 April 1979, in reaction to the army being sent towards the UNIFIL area under the March 1979 defence law; de Clerck and Malsagne put its size at 250 square kilometres and call it entirely reliant on Israel. Hanf has Haddad's troops stopping the battalion; de Clerck and Malsagne and Picard, Israeli aircraft bombing it; Fisk, Israel letting its militia shell it. Traboulsi dates Haddad's break to his Army of Free Lebanon of June 1976, Ménargues to a secession at the end of 1977. Hanf adds that once Haddad had lost his rank and been dismissed in disgrace, Israel paid his men.

In Ménargues's account Damascus rejected Takieddine Solh, finding him too lukewarm about Lebanese–Syrian friendship, and offered three names instead, Selim Hoss's among them.

Ménargues and Fisk date the decision to form the committee to 14 June; Traboulsi has it convening on 20 June. Philip Habib attended its sessions of 22 and 23 June. Its agenda, Traboulsi notes, dealt with the PLO's withdrawal, not the Israeli occupation; Jumblatt quit the committee and the cabinet rather than 'deal the final blow to the Palestinians', and Berri stopped taking part.

The massacre lasted from the evening of Thursday 16 September to the morning of Saturday 18 September (Traboulsi gives 15-17, Hanf 17-18). The killers were militiamen of the Lebanese Forces' security service under Elie Hobeika, together with men of Saad Haddad's South Lebanon militia. The Israeli army, which controlled the area after entering West Beirut on 15 September, let them into the camps, lit the camps with flares at night and watched from command posts nearby. Israel's Kahan Commission, published on 7 February 1983, held the Phalangists directly responsible and found Defence Minister Ariel Sharon personally responsible, recommending his removal; it also attributed indirect responsibility to other Israeli political and military leaders. Estimates of the dead range from about 460-800 to 3,500; Bayan Nuwayhed al-Hout's survey found victims of twelve nationalities, about half Palestinian and more than a quarter Lebanese.

On 8 November 1982 PSP men attacked a Christian funeral in Kfar Nabrakh, a mixed Chouf village, killing eleven, in reaction to a Lebanese Forces checkpoint set up nearby. Some twenty houses were burned and nine villagers abducted; their bodies were found in a well on 23 November. De Clerck and Malsagne call it the Mountain War's first massacre.