Banu Bakr, allies of Quraish, attack Banu Khuza’ah, allies of the Muslims, at night — with Quraish supplying men and weapons — and pursue them even into the Sanctuary. Khuza’ah ride to Madinah for help. Abu Sufyan comes to renew the treaty but returns empty-handed.
As the book dates it: Sha’ban, 8 A.H.