 Banu Bakr, without caring a bit for the provisions of the treaty, attacked Banu Khuza'a in a place called Al-Wateer in Sha‘ban, 8 A.H. Quraish helped Banu Bakr with men and arms taking advantage of night.Pressed by their enemies, the tribesmen of Khuza‘ah sought the Holy Sanctuary, but here too, their lives were not spared, and Nawfal, the chief of Banu Bakr, chasing them in the sanctified area — where no blood should be shed — massacred his adversaries.There are instances according to Islamic tradition where Muhammad is thought to have sent letters to other heads of state during the Medinan phase of his life.