The youngest son of Kurbat, Atilkesе with nickname Asparukh, had his seasonal coaching route between Burdjan and Bekhtash, and the Utigs's and Murdases were also submitted to him. His main stan was in the city of Burdjan in the south of Djurash. He was very amicable with his uncle Shambat, the sitting Ulugbek of the Bashtu, who was surrounded by both loyal Bulgarian Saklanian biys and the Anchian boyars. This attachment was not overly pleasing for Kurbat, who always suspected his brother of propensity for treachery, so Atilkese received an ulus remotest from Kyi... .

While such a Khakan was alive, the country was peaceful. But when in the 660 AD he was striken by death, Shambat, with support of Atilkese, raised arms against the new Khakan Bat-Boyan, with a purpose of seizing the throne. They let him rule more or less calmly for three years only, and then they started an open war against him. Because Kurbat before his death forbade Bulgars to fight each other, Shambat attacked the Kan with the forces of the Ak-Balynian Ulchians and Saklan-Uruses, and Atilkese attacked with the forces of Murdases, Masguts, Turks, and a hired band of Turkmens...

The war went on for a few years. Atilkesé managed to crush the Bat-Boyan’s Sabans, then he devastated As-Bandja, and together with Shambat besieged the Khakan in Djalda. In the action, the Bek's people, and especially Murdases, killed many Bulgars of the Kan. That caused a bad hostility between the Black Bulgars and that Saklanian tribe. The Khakan complained to Atilkese about the actions of his people, but Atilkese sarcastically replied: ”Murdases could not distinguish between your Bulgars and Sabans, because they really speak the same Sabanian language... .”

With support from Atilkese, Shambat was besieging Djalda for five years, and in the other part of the Saklan-Bulgarian state he was accepted as a Khakan.

In the heat of the siege the Turkic Khakans, whose might has increased again, attacked the Saklan across Agidel. It is said that then across the river from Turkistan came 150 thousand Kumans, Turkmen Kuk-Oguzes and Kyrgyzes, united by a name of Hazar, a founder of the Turkic state. Shambat with Atilkese raced towards the enemy, but were defeated and fled to Bashtu with a part of their forces.

This route happened because during the battle the Djurashian Turks, Murdases and Utigs switched over to the side of the Khazars, and the Serbiys fled to the north and hid in the Sura forests. The Khazars gained many captured Burdjan Bulgars, whom they forced to fight on their side.

The Djalda Bulgars were so angery with the others that they wanted to finish off immediately their defeated fellow tribesmen in the Bashtu. But noble Bat-Boyan did not allow these bad feelings, and he led Kimmerians against the Khazars. The opponents met at the river which we called Almysh, and the Kyrgyzes called Kelmes, and Khakan Bat-Boyan urged Kalga, the leader of Khazars, to return the territory of the Saklan that he unlawfully took.

In reply, Kalga ordered his forces to ford the small river, and a fierce fight erupted. Tangra helped his slaves, and made the Burdjan leader Khumyk to join his fellow tribesmen, after which the Bulgars, with the support of the heroic Anchians, managed to gain a full victory. From both sides fell 90 thousand soldiers, of which 50 thousand were Khazars, and Kalga was hacked up by Khumyk, and from that time the Khazars called the small river Almysh "Kalga".