Davazdah Rokh

The battle begins when Piran's brother, Houman, challenges the Iranians and is killed by Bizhan in a single combat.

However, Gostaham, who has not been chosen by Kay Khosrow to fight with Turanians, chases Lahhāk and Faršēd, brothers of Piran, and kills them, although he himself is severely injured in the process, whereupon Bizhan takes him to Kay Khosrow, who saves his life by the expedient of binding a healing amulet to his arm.

In some manuscripts of Shahnameh the story is entitled az Yazdah Rokh (Eleven combats), not counting the last fight between Gostaham and Piran's brothers.

The campaign ends with the victory of Iran and the implementation of a festival in honour of the empire’s noble ruler Kai Khosrow and Goudarz the valiant commander of his sovereign’s army.

According to shahnameh the place of war was in the area near Zibad Castle or black mountain of Gonabad in Iran state of Greater Khorasan .