Banu Bakr
According to the terms of the Treaty of Hudaybiyyah, the Arab tribes were given the option of joining either of the sides, the Muslims or Quraysh. Should any of these tribes face aggression, the party to which it was allied would have the right to retaliate. As a consequence, Banu Bakr joined Quraysh, and Khuza'ah joined the Muslims. They thus lived in peace for some time; but ulterior motives stretching back to the pre-Islamic period, ignited by unabated fire of revenge, triggered fresh hostilities. Banu Bakr, without concern for the provisions of the treaty, attacked Banu Khuza'a in a place called Al-Wateer in Sha'ban, in 8 AH. Quraysh helped Banu Bakr with men and arms, taking advantage of the dark night. Pressed by their enemies, the tribesmen of Khuza'ah sought the Holy Sanctuary, but here too, their lives were not spared, and, contrary to all accepted traditions, Nawfal, the chief of Banu Bakr, chased them in the sanctified area — where no blood should be shed — and massacred his adversaries. Khuza'ah at once sent a delegation to Medina to inform Muhammad of this breach of truce and to seek help from the Muslims of Medina being their allies.