The Battle of Marj al-Saffar, which took place in January 635 CE, was a key conflict during the Muslim conquests after Prophet Muhammad's death. This battle occurred near Damascus, a crucial strategic location at that time. Damascus was under the control of Thomas, the son-in-law of Byzantine Emperor Heraclius. In response to the advancing Muslim forces led by Khalid ibn al-Walid, Thomas sought reinforcements from Emperor Heraclius, who was in Emesa. To delay or stop Khalid's march towards Damascus, Thomas sent out armies. One of these armies was defeated at the Battle of Yaqusa in mid-August 634. The Battle of Marj al-Saffar, part of this series of defensive efforts, took place on January 23, 635. A notable figure in this battle was Umm Hakim bint al-Harith ibn Hisham, a Muslim heroine, who is said to have killed seven Byzantine soldiers. This battle was significant in the early Islamic conquests, which rapidly expanded Muslim territory beyond the Arabian Peninsula and changed the regional power dynamics.