During the Black September clashes in Jordan, al-Wazir supplied the encircled Palestinian forces in Jerash and Ajlun with arms and aid, but the conflict was decided in Jordan's favor. After Arafat and thousands of Fatah fighters retreated to Lebanon, al-Wazir negotiated an agreement between King Hussein and the PLO's leading organizer, calling for better Palestinian conduct in Jordan. Then, along with the other PLO leaders, he relocated to Beirut.