How Did Saladin Retake Jerusalem?

How Did Saladin Retake Jerusalem? How did Saladin capture Jerusalem? In 1186/87 the Crusader prince Reginald of Châtillon broke a truce with Saladin, who responded by declaring war. Saladin slaughtered the Crusader army (and executed Reginald) in July 1187 at the Horns of Ḥaṭṭīn. Jerusalem, now undefended, surrendered to him in October. What was Saladin’s