When Ismail was twenty-seven years old, he discovered that he wasn’t God after all. The Ottomans dealt him this lesson by invading his realm. Spoiling for a fight, Ismail rushed to meet them. The two armies clashed on the plains of Chaldiran, near the city of Tabrez. The Ottomans had firearms, but the Safavids thought they had something better: old-fashioned religious fervor and a divinely guided leader. This time, firearms proved more useful. Selim crushed Ismail’s forces, almost killed Ismail, and took his capital of Tabrez.