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BATTLE // January 1, 0635

Battle of Fahl

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Overview

The Battle of Fahl, also known as the Battle of the Marshes and the Battle of Beisan, was a major battle in the Muslim conquest of Byzantine Syria fought by the Arab troops of the Rashidun Caliphate and Byzantine forces at or near Pella (Fahl) and nearby Scythopolis (Beisan), both in the Jordan Valley, in December 634 or January 635.

Overview adapted from Wikipedia, licensed under CC BY-SA 4.0.

Significance

The Battle of Fahl, fought in the Jordan Valley near Pella and Scythopolis, was a major engagement in the Muslim conquest of Byzantine Syria during the broader Muslim conquest of the Levant. The battle brought together multiple senior Rashidun commanders — Abu Ubayda ibn al-Jarrah, Khalid ibn al-Walid, Amr ibn al-As, Shurahbil ibn Hasana, and Anas ibn Malik — against a Byzantine force under Theodore Trithyrius that substantially outnumbered the Arab army, with Byzantine strength estimated between 50,000 and 100,000 against a Rashidun force of 20,000 to 30,000. The reported Byzantine casualties of 100,000 indicate a decisive Arab victory, one that would have significantly degraded Byzantine capacity to defend the Jordan Valley and the surrounding region. Control of the area around Pella and Scythopolis held strategic weight within the Jordan Valley corridor, and the engagement formed part of the sustained Rashidun campaign to reduce Byzantine presence across Syria that characterized this phase of the conquest.

Forces & casualties

Troop strength

  • Rashidun Caliphate20,000–30,000
    medium
  • Byzantine Empire50,000–100,000
    medium

Byzantine Empire fielded a 3.0 : 1 numerical advantage

Casualties

  • Byzantine Empire100,000
    medium133% loss rate

Commanders (6)

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Related

6 sibling battles · 0 factions

Last verified July 2026
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