Musnad Ahmad 32:287

Yazid narrated to us, Hammad informed us, from Thabit al-Bunani, from Anas, who said: On the day of al-Hudaybiyyah, eighty men from the people of Mecca descended upon the Messenger of Allah, peace and blessings of Allah be upon him, and his companions, armed, from the direction of Mount al-Tan'im. He prayed against them, so they were captured. Then this verse was revealed: "And it is He who withheld their hands from you and your hands from them within [the valley of] Makkah after He caused you to overcome them" [Al-Fath: 24]. He said: He means Mount al-Tan'im of Mecca.