When the day dawned the two forces met in battle array. The Quraish raised boastful cries highlighting their superiority, skill, and richer resources. The Muslims were in a humble mood, and invoking the aid of God they raised the shouts "Allah-o-Akbar" Allah is great. That was the first battle to be fought by the Muslims, and they had no previous experience of war. The Holy Prophet, however, exhibited the qualities of a great military General. He marshaled the Muslim forces in a superb way, and arrayed them in such manner that they could contend against the larger force of the enemy. The previous night it had rained. That worked to the advantage of the Muslims for the rocky ground under their feet became firmer, while the ground under the feet of the Quraish became muddy and slippery. The Holy Prophet divided the Muslim force in a number of commands, each under a Commander. One unit was placed under the command of Ali and he was given the flag by the Holy Prophet.
As a prelude to the battle proper, three warriors, Utba, Shaiba, and Al Walid stepped out of the ranks of the Quraish, and challenged the Muslims to duel in single combat. In response to this challenge three Ansars stepped out of the ranks of the Muslims to fight the duel. The Quraish taunted the Muslim emigrants, and wanted them to come forward to cross swords with them if they had any trait of chivalry about them. Thereupon Ali was the first to step forward from the ranks of the Muslims to accept the challenge of the Quraish. He was followed by Hamza and Ubaida b Harith. In the contest that followed Ali killed Al Walid; and Hamza killed Shaiba. In the duel between Ubaida and Utba, Ubaida was mortally wounded. Ali and Hamza rushed to the help of Ubaida and cut off the head of Utba. Thereupon with a cry of rage three Makkans darted to assail Ali and Hamza. All the three Makkans fell dead before the blows of the swords of Ali and Hamza.
Exasperated at the death of its six warriors in single combat, the Quraish led the charge, and tried to break through the ranks of the Muslims. The Muslims stood fast at their posts, and when the fury of the Quraish force was spent, the Muslims launched a counter attack, and forced the Quraish to fall back. The ground was muddy and slippery and in the confusion that followed many Quraish slipped in the mud when the Muslims availing of the advantage thrust their swords in their bodies. Miraculously the battle ended in the favor of the Muslims. Over seventy persons from among the Quraish fell dead on the battlefield. All the leaders of the Quraish who held the command were killed. Over seventy persons were taken prisoners. A large booty fell into the hands of the Muslims. Ali was most conspicuous in performing prodigies of valor. According to traditions he killed twenty-one persons. Two brothers of Ali Talib and Aqueel fought on the side of the Quraish. Out of these Talib was killed and Aqueel was taken prisoner. When the booty was distributed Ali got an armor, a sword, and a camel.