This is the third episode of a five part series on the Mongol invasions and the astonishing reversal that followed. It tells the story of the day the unstoppable were finally stopped: the Battle of Ain Jalut, fought on the twenty fifth of Ramadan, the third of September 1260, in the Jezreel Valley of Galilee.

The episode begins with the men who marched out of Egypt, the Mamluks, slave soldiers bought as boys on the same steppe the Mongols came from and raised into the most disciplined heavy cavalry in the Islamic world. We meet Sultan Qutuz, a Khwarazmian prince enslaved as a child, and his brilliant general Baybars, the Qipchaq Turk who had already broken the Seventh Crusade and captured King Louis the Ninth of France. We read Hulagu's chilling ultimatum to Qutuz, with its promise to shatter the mosques and reveal the weakness of his God, and we watch Qutuz answer it by executing the envoys and mounting their heads on the Bab Zuwayla gate of Cairo. Then comes the battle itself, where the Mongols' own signature trick, the feigned retreat, was turned against them by men who had been born to it, and where Qutuz tore off his helmet and charged crying Wa Islamah, O my Islam.

The episode is careful about what the sources can prove. It gives the honest version of Ain Jalut: the armies were roughly matched, not ten to one, and the deepest cause of the Mongol defeat was the death of the Great Khan Mongke, which had stripped away their numbers. Ain Jalut broke the myth of Mongol invincibility, but it did not end the war. And the victory was soaked in regicide within weeks, when Baybars assassinated Qutuz on the road home and took the throne.

The deepest turn, though, happened far to the north. Berke, grandson of Genghis Khan and ruler of the Golden Horde, had become the first Mongol khan to embrace Islam, won over by merchants and Sufis of Bukhara. When he learned that his cousin Hulagu had destroyed Baghdad and killed the khalifa, he allied with the Mamluks and went to war against his own family, crushing Hulagu's army at the frozen Terek River in 1263. The episode is honest that Berke also had hard material motives, pastures, the slave trade, and a wider Mongol civil war, while insisting that the faith was real, central, and new. Mongol against Mongol, because of Islam.

Sources: al-Maqrizi's Kitab al-Suluk, Ibn Abd al-Zahir's biography of Baybars, Ibn Kathir's al-Bidaya wa al-Nihaya, al-Nuwayri's Nihayat al-Arab, and Rashid al-Din's Jami al-Tawarikh, with modern scholarship and accessible Islamic history sources including Saudi Aramco World, Britannica, Lost Islamic History, and the Yaqeen Institute.

Content Warning: This episode describes the Battle of Ain Jalut, the execution of envoys, the killing of commanders, and the assassination of Sultan Qutuz, handled factually and without graphic detail.

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