Final answer:
The battle at Hattin and Acre had significant effects on the Crusades, resulting in the capture of Jerusalem by Saladin and prompting the launch of the Third Crusade led by King Richard I of England. The Crusaders ultimately lost their Mediterranean stronghold at Acre in 1291, marking the end of the Crusades and the withdrawal of Christians from the region.
Step-by-step explanation:
The battle at Hattin and Acre had significant effects on the Crusades. The Battle of Hattin, which took place in 1187, resulted in a decisive victory for Saladin and the Muslim forces, leading to the capture of Jerusalem. This event galvanized Europe to launch the Third Crusade, led by King Richard I of England, to regain control of the Holy Land. However, the Crusaders ultimately lost their Mediterranean stronghold at Acre in 1291, marking the end of the Crusades and the withdrawal of Christians from the region.