Battle of Ganzak

The Battle of Ganzak was a clash between the Byzantine and Sasanian armies. The emperors of both empires personally took part in this battle. The Persians suffered a crushing defeat, and Khosrow fled leaving his army. As a result of this, Heraclius was able to move deeper into Persia.

Background

After Khosrow refused the peace treaty, sending an insulting letter in response, Heraclius marched on Caucasus, using Khosrow's letter as a tool of inspiration and propaganda for his army. Already on the way, he learned that Khosrow was with 40,000 soldiers in Ganzak.
Khosrow's letter looked like this:

Battle

Heraclius sent the faithful Arabs forward, who defeated the guards of the Sasanian king. After this, Khosrow fled to the south, and Heraclius killed the remnants of his troops.

Aftermath

Khosrow fled south to Dastagard, where his army finally dispersed. At this time, Heraclius took Ganzak, and after that he burned the famous temple Takht-e Soleymān. Heraclius raided the region of Atrpatakan, as far as the King's residence at Gayshawan and continued his campaign.