Shi'a sources say they were Jews , while a Jewish source says they and the Banu Khazraj were Arab tribes from Yemen who came to Medina in the fourth century CE. The Jewish source continues to say that the two tribes took the power of Medina from the Jews in the fifth century "By calling in outside assistance and treacherously massacring at a banquet" .
However, all sources agree that the Banu Aus and Banu Khazraj became hostile to each other.
A Shi'a source states that they had been fighting for one hundred and twenty years and were sworn enemies.
During the battle, The Banu Nadir and the Banu Qurayza fought with the Banu Aus, while the Banu Qaynuqa were allied with the Banu Khazraj. The latter were defeated after a long and desperate battle.<ref... Read More