The main cause of the Battle of Uhud was that

u Sufyan Ibn Harb was determined to destroy Muslims. In the Battle of Uhud, Abu Sufyan Ibn Harb led the Quraysh army to attack Medina, seeking revenge for their defeat at the Battle of Badr. The Muslims, under the leadership of Prophet Muhammad (peace be upon him), went out to confront them. However, due to a tactical error made by a group of Muslim archers, a portion of the Muslim army was left unprotected, and the Quraysh were able to turn the tide of the battle in their favor. Despite the setback, the Muslims were able to regroup and repel the Quraysh army.