Historians date the entry of Syrian regular troops to 1 June 1976 (Ménargues gives 9 June). President Assad announced it in the presence of the visiting Soviet Prime Minister Kosygin, citing appeals from the Akkar villages of Qubayat and Andaqit, besieged since January and attacked by the Lebanese Arab Army on 27 May. Columns moved towards Akkar and Tripoli, Zahleh and the Bekaa, and Sidon by way of Jezzine. Estimates of the force range from 6,000 men at the start (with 260 armoured vehicles, according to Ménargues) to 12,000-15,000 within weeks, with 250-300 tanks (de Clerck and Malsagne).

Karami had announced his resignation on 4 May. Who was responsible is disputed: Hanf (1993) writes that it was never established who planted the bomb in the army helicopter; de Clerck and Malsagne report that it was attributed to Samir Geagea's Lebanese Forces, and Picard notes that Geagea was later tried for it. Selim al-Hoss, Minister of Education, became acting prime minister; the cabinet never met again and governed by circulated decrees.

Hanf: Aoun told the Tunis meeting he could settle Lebanese differences himself once Syria withdrew; Hoss and Husseini put reform first.