Why was the Battle of al-Qadisiyyah a turning point?

Fought in November 636 AD, the Battle of al-Qadisiyyah was a decisive engagement between the Rashidun Caliphate and the Sasanian Empire. The Rashidun victory led to the fall of the Persian capital of Ctesiphon and enabled the eventual annexation of the Sasanian Empire. Researchers recently identified the historical battle site in southern Mesopotamia, roughly 19 kilometers south of modern-day Kufa.

What we know

• The Battle of al-Qadisiyyah took place in November 636 between the Rashidun Caliphate and the Sasanian Empire. [1, 2]
• Sasanian troops fell into disarray and collapsed following the death of their general, Rustam Farrokhzad. [2]
• Defeat at al-Qadisiyyah left the Sasanian army unable to defend Ctesiphon, forcing a retreat from Mesopotamia. [2]
• Scholars from Durham University and the University of al-Qadisiyyah identified the likely site of the battle in 2024. [2]

Still open

• The precise circumstances surrounding the death of the Sasanian general Rustam Farrokhzad remain uncertain.

Where to go next

• what followedWhat caused the fall of the Sasanian Empire?
• how it workedHow did the Rashidun army capture Ctesiphon?
• how we knowWhere was the battlefield located?
• the bigger pictureWhat happened during the Muslim conquest of Persia?
• whoWho was Rustam Farrokhzad?
• an unexpected connectionHow did early Islamic conquests connect to Byzantine alliances?Sources note that the Sasanian Empire allegedly formed an alliance with their long-time Byzantine rivals to counter the simultaneous Rashidun invasions.

Sources

• [1]Battle of al-Qadisiyyah (Wikidata Q836844) · CC0 1.0
• [2]Battle of al-Qadisiyyah · CC BY-SA 4.0
• [3]Al-Qadisiyyah (historical city) · CC BY-SA 4.0
• [4]Battle of Sagrajas · CC BY-SA 4.0
• [5]Battle of the Bridge · CC BY-SA 4.0