The Sasanian army led by Smbat Bagratuni quickly defeated the Hephthalites raid who, in response, called the Gokturk Empire for assistance.
The Gokturks responded with a large army that raided as far as Ray and the province of Isfahan.
The raid was defeated with Smbat killing the Hephthalites leader in single combat.
In 614 the Hephthalites raided eastern Persia with a large number of men, but were defeated in the first battle near the fort of Tus in Khorasan.
[2] The Gokturk forces quickly overran Khorasan, but could not breach the fort of Tus with its 300 defenders.