Previously in our animated documentary series on the early Muslim expansion, we have covered the battles of Yarmouk, al-Qadisiyyah, Talas and the siege of Constantinople of 717-718. However, one crucial confrontation in the conquest of the Roman Syria by Khalid ibn al-Walid was missed - the Siege of Damascus in 634. So, now you can learn more about the events which led up to the battle of Yarmouk