Abu Ubaidah ibn al-Jarrah
The ambassador took the daughter of Heraclius, and returned to Antioch. The return of the Mobile Guard loaded with spoils was greeted with joy by the Muslims at Damascus. The whole operation from pursuit to the return of the Mobile guard had taken 10 days. They returned on October 1, 634. Upon his return Khalid was informed of the death of Caliph Abu Bakr and the succession of Umar as the new caliph. Umar deposed Khalid from his command and appointed Abu Ubaidah ibn al-Jarrah as the new commander in chief.