The Expedition of Abdullah ibn Unais, also known as the Assassination of Khaled bin Sufyan was the 1st attack against the Banu Lahyan, which took place in the month of Muharam in the year 4 A.H. it was reported that Khaled bin Sufyan Al-Hathali (also known as Hudayr, the chief of the Banu Lahyan tribe), considered an attack on Madinah and that he was inciting the people on Nakhla or Uranah to fight Muslims. So Muhammad sent Abdullah ibn Unais to assassinate him. After cutting off Sufyan bin Khalid's head at night, Unais brought it back to Muhammad.