The Battle of Chaldiran took place on 23 August 1514 and ended with a decisive victory for the Ottoman Empire over the Safavid Empire. As a result, the Ottomans annexed Eastern Anatolia and Upper Mesopotamia from Safavid Iran. It marked the first Ottoman expansion into Eastern Anatolia, and the halt of the Safavid expansion to the west. The Battle of Chaldiran was just the beginning of 41 years of destructive war, which only ended in 1555 with the Peace of Amasya. Though the Safavids eventually reconquered Mesopotamia and Eastern Anatolia under the reign of Abbas the Great, they would be permanently ceded to the Ottomans by the 1639 Treaty of Zuhab.