Abu Sufyan ibn Harb.
Banū Sulaym met the force at Marr al-Zahrān, seven hundred strong, and Banū Asad came out to join them under the leadership of Ṭulayḥah ibn Khuwaylid al-Asadī.
Fazārah then set out with one thousand camels, led by ʿUyaynah ibn Ḥiṣn, while Ashjaʿ marched forth—four hundred men—under al-Ḥārith ibn ʿAwf.
(Some said he turned back with Banū Murrah, but the first report is better attested.)
Thus the total strength of the Confederates reached ten thousand, all placed under the overall command of Abu Sufyan, whereas the Muslims numbered three thousand.
Such is the account given by al-Wāqidī.

Ibn Isḥāq, however, states that the Expedition of the Trench took place in Shawwāl. He relates that Salām ibn Abī al-Ḥuqayq, Ḥuyayy ibn Akhṭab, Kinānah ibn al-Rabīʿ, and Hawdhah, together with a group from Banū al-Naḍīr and another from Banū Wāʾil—these being the men who marshalled the Confederates against the Messenger of Allah ﷺ—came to Mecca and urged Quraysh to fight, saying, “We shall remain with you until we have annihilated Muhammad.”
Quraysh replied, “O community of Jews, you are people of the Scripture and possess knowledge of the issues over which we and Muhammad differ: is our religion better, or his?”
They answered, “Your religion is better than his, and you are closer to the truth.”
Concerning them the words were revealed: “Have you not seen those who were given a portion of the Book, yet believe in superstition and false deities, and who say to the disbelievers, ‘These are better guided than the believers’?” (Qur’an 4:51), and the verses that follow.
When they said this to Quraysh, the latter were delighted, grew eager for war, and fixed a pact with them. The same Jewish delegation then went on to Ghatafān, invited them, and they agreed.

Thus Quraysh set out, and Ghatafān also marched, ʿUyaynah leading the contingent of Banū Fazārah,