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The Battle of Fahl or Battle of Pella Arabic: معركة فحل was an Arab–Byzantine battle fought between the Rashidun army under Khalid ibn al-Walid Saifullah (meaning: The Sword of Allah) and the Roman Empire under Theodore the Sacellarius (Saqalar), in Fahl (ancient Pella along the Jordan Valley of Jordan) in January 635 AD (13 AH). The result was a clear victory for Khalid ibn al-Walid. Some roman soldiers fled to Beisan. The cores of Sharhabeel ibn Hasana and 'Amr ibn al-'As later captured the fortress of Beisan.
- A.I. Akram (1970). The Sword of Allah: Khalid bin al-Waleed, His Life and Campaigns. Nat. Publishing House. Rawalpindi. ISBN 0-7101-0104-X.