Early in 1983 the Eighth Brigade went into all of Beirut, the east included, under a plan to collect light arms in the city and clear heavy weapons and gunmen from Greater Beirut. The Lebanese Forces resisted, then on 1 March 1983 agreed to return East Beirut and the port's fifth basin to the state.

Massacres were committed on both sides: Druze fighters killed Christians at Bmaryam, Bhamdoun, Ma'asir al-Chouf and many other villages, and Lebanese Forces fighters killed Druze at Kfarmatta and in villages on their line of retreat. For September to December 1983 de Clerck and Malsagne give more than 1,500 Christians and 207 Druze massacred, 324 PSP and 368 Lebanese Forces fighters dead, and over 163,000 Christians driven from the region. Traboulsi gives 62 villages destroyed, Hanf about sixty.

The Lebanese army had under 24 hours' warning, Fisk writes, before Israeli troops began leaving Aley and the Chouf on the evening of 3 September; by the morning of the 4th they had gone. De Clerck and Malsagne count more than 10,000 Christians from over 60 villages sheltering in Deir el-Qamar.

From 19 September the destroyer John Rodgers, then the cruiser Virginia, shelled Druze positions at Souk el-Gharb. Washington cited US personnel's safety; Fisk and Hanf see entry into the civil war. Only the frigate Bowen had fired before, on 8 September, at a Druze battery hitting the Marine compound.