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BATTLE // January 1, 0634

Battle of Ajnadayn

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Overview

The Battle of Ajnadayn was fought in July or August 634, in a location close to Bayt Jibrin; it was the first major pitched battle between the Byzantine (Roman) Empire and the army of the Arab Rashidun Caliphate. The result of the battle was a decisive Muslim victory. The details of this battle are mostly known through Muslim sources, such as the ninth-century historian al-Waqidi.

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

Significance

The Battle of Ajnadayn, fought in July or August 634 near Bayt Jibrin, was the first major pitched battle between the Byzantine Empire and the Rashidun Caliphate in the Muslim conquest of the Levant. The engagement resulted in a decisive Muslim victory, with Byzantine forces of approximately 40,000 suffering reported casualties of 50,000 against a Rashidun force of around 20,000 that sustained roughly 5,000 losses. The scale of the Byzantine defeat and the disparity in casualties underscored the early military effectiveness of the Rashidun armies under commanders including Khalid ibn al-Walid, Amr ibn al-As, and Abu Ubayda ibn al-Jarrah. As the first large-scale confrontation of the campaign, Ajnadayn established the pattern of Rashidun offensive momentum that would characterize the broader conquest of the Levant through the remainder of the 630s. Most accounts of the battle derive from Muslim sources, notably the ninth-century historian al-Waqidi, meaning the record reflects one belligerent's perspective on an engagement that nonetheless proved foundational to the Arab expansion into Byzantine-held territory.

Forces & casualties

Troop strength

  • Byzantine Empire40,000
    medium
  • Rashidun Caliphate20,000
    medium

Byzantine Empire fielded a 2.0 : 1 numerical advantage

Casualties

  • Byzantine Empire50,000
    medium125% loss rate
  • Rashidun Caliphate5,000
    medium25% loss rate

Commanders (12)

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Last verified July 2026
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