Ratified by an Arab summit in Cairo on 25 October, the Riyadh decisions required all parties to surrender heavy weapons and the Palestinians to return to the zones granted by the 1969 Cairo Agreement, and created a 30,000-man Arab Deterrent Force under President Sarkis, its largest contingent by far, 25,000-27,000 men, being the Syrian troops already in Lebanon. Saudi Arabia had sent the invitations on 15 October; the leaders of Saudi Arabia, Kuwait, Egypt, Syria and Lebanon met the PLO chairman in Riyadh on 16, 17 or 18 October, depending on the historian. The cease-fire's start is dated 16 October (Hanf), 21 October (Traboulsi) or 15 November (de Clerck and Malsagne).

Fourteen Super-Étendards from the carrier Clemenceau attacked the Sheikh Abdallah barracks and the Khawam hotel, used by the Revolutionary Guards and Islamic Amal. The barracks had been evacuated after a leak, and most bombs fell on nearby hills; de Clerck and Malsagne count two dead, an Iranian and a Lebanese shepherd. The raid, code-named 'Brochet', was presented as retaliation for the Drakkar bombing.

Aoun, Hanf writes, warned that any Christian deputy joining a Moawad-Hoss government would lose the right to live in the 'free areas'. When bombs hit the homes of many Christian deputies after the election, his condemnation was half-hearted: he voiced 'understanding for the anger of the people'.