Battle of Marj ar-Rum

[2][5] The battle is considered as a decisive victory for the Rashidun army as all the Byzantine commanders were killed and the threat of losing Damascus ended.

Sensing an opportunity to recover Damascus, Heraclius immediately sent an army under the command of Theodore the Patrician to recapture the city.

When night fell, Theodore and his vice commander Sheodore quietly pulled back their troops under the cover of darkness to advance upon Damascus.

[1] In the morning at Marj ar-Rum, the battle began with a personal duel between the field commanders, wherein Shannash was slain by Abu Ubaydah.

The news of the upset at Damascus quickly spread to the field at Marj ar-Rum causing the Byzantine forces to lose their nerve and retreat, ending the battle.

A week later, Abu Ubaida captured Baalbek (Heliopolis) where the Temple of Jupiter stood later sending Khalid to attack Emesa.