The Battle of Hattin was a significant military engagement that took place on July 4, 1187, during the Crusades. It occurred near the Horns of Hattin, a set of hills in present-day Israel, and was fought between the forces of the Kingdom of Jerusalem, led by Guy of Lusignan, and the Ayyubid Sultanate, led by Saladin (Salah ad-Din).

The events leading up to the Battle of Hattin were marked by tensions between the Crusader states and the Ayyubid Empire, with Saladin seeking to reclaim territories that had been captured by the Crusaders. He had successfully captured several key cities, which put pressure on the Crusaders.

The battle itself was a decisive victory for Saladin's forces. The Crusader army was heavily outnumbered and found itself in a precarious position due to the arid and waterless terrain. Saladin's forces managed to surround the Crusaders and cut off their access to water sources. This strategic maneuver weakened the Crusaders' morale and ability to resist.

During the battle, the Crusader forces suffered from dehydration, exhaustion, and lack of supplies. In the scorching heat of the desert, they were unable to mount a cohesive defense. Ultimately, Saladin's forces overwhelmed the Crusaders, capturing or killing many of their leaders, including King Guy of Jerusalem. This victory significantly weakened the Crusader presence in the Holy Land and paved the way for Saladin to capture Jerusalem later that year, in October 1187.

The fall of Jerusalem to Saladin was a pivotal event in the history of the Crusades. It prompted the launch of the Third Crusade, which aimed to recapture the city and regain control over the Holy Land. The Third Crusade would later see the involvement of prominent European leaders such as King Richard the Lionheart of England, King Philip II of France, and Holy Roman Emperor Frederick Barbarossa.

The Battle of Hattin and the subsequent events underscored the complexities and challenges faced by both sides during the Crusades, as well as the military and strategic prowess of Saladin in his efforts to retake Jerusalem and consolidate his rule in the region.