It is narrated from Sayyiduna Ibn Umar, may Allah be pleased with him, that he presented himself before the Noble Prophet, peace and blessings be upon him, at the time of the Battle of Uhud. At that time, he was fourteen years old, and the Prophet did not permit him to participate in the battle. Then he presented himself at the time of the Battle of the Trench, and at that time he was fifteen years old, so the Noble Prophet, peace and blessings be upon him, permitted him to participate in the battle.