'Amr ibn al-'As
In the year 629 Muhammad sent 'Amr ibn al-'As to Daat al-Salaasil from where he called for reinforcements, this was known as the Expedition of Abu Ubaidah ibn al Jarrah. Muhammad sent Abu Ubaidah in command of an army that included Abu Bakr and Umar. They attacked and defeated the enemy. Later in the same year, another expedition was sent under his command to locate the routes of Qurayshi caravans.