Treaty of Hudaybiyyah
He was among the twenty horsemen sent as an advance guard to Hudaybiyyah and he was on the night-watch roster. One night the Quraysh sent fifty men to the Muslim camp. Ibn Maslamah managed to capture them and bring them to Muhammad. According to one tradition, he was later a witness to the Treaty of Hudaybiyyah; but an alternative tradition asserts that the witness was his brother Mahmud.