After the end of the wars of apostasy and stability in the Arabian Peninsula, Abu Bakr sent four armies to open to the Levant, and the leaders of the armies were Yazid ibn Abi Sufyan, Abu Ubaidah ibn al-Jarrah, Amr ibn al-Aas, Shurahbil ibn Hasana. And because of the difficulties that was faced by these armies due to the strength of the armies of the Byzantine Empire and its huge numbers, Abu Bakr ordered Khalid ibn al-Walid to march with a half of the Iraqi army towards fronts of the Levant and command the armies there.