On receiving complaint against Banu Zabada, the Holy Prophet ordered punitive action. The Holy Prophet appointed Ali as the Commander of the expedition to be led against the rebellious tribe. Ali led a Muslim force to meet the rebels. When the two forces confronted each other in battle array, Amar b Madi Kurb stepped forward from the ranks of Banu Zabada, boasted of his lineage and his skill as a warrior, and challenged Ali, the Commander of the Muslim force to a single combat. Ali stepped forward and raised the shout of A11ah-o-Akbar. The shout of Ali was more ferocious than the roar of a lion, and it struck terror in the hearts of the enemy. When the duel began, Amar aimed blows at Ali who skillfully avoided all blows. Then it was the turn of Ali to strike at his adversary. The charge of Ali was so forceful that Amar reeled under it and fell on the ground helpless. Ali bade him rise up, and take the sword. Amar rose from the ground, but he was too nervous to fight. He took to his heels and fled from the battlefield. The flight of their leader demoralized the force of Banu Zabada and it laid down arms without fight. Ali returned victorious to Madina, and in his train followed a large number of captives. According to traditions the men of Banu Zabada said that as they faced the Muslims on the battlefield, it appeared to them that some super natural power was aiding the Muslims. The men of Banu Zabada repented and were re-converted to Islam. Later Amar also appeared before the Holy Prophet, offered repentance, and was reconverted to Islam.