The Sankosh River divided the two new kingdoms, and it is roughly the boundary between the present-day Assam and West Bengal.

Raghudev, accompanied by some trusted state officers, traveled east on a purported hunting trip and declared himself king of the eastern portion at a place called Barnagar near the Manas River.

Nara Narayana did not react aggressively, and the kingdom was divided amicably with Raghudev promising to pay an annual tribute.

[11] Raghudev, with the help of Isa Khan, attacked Bahirbandh in Koch Bihar, and Lakshmi Narayan submitted on his own accord to vassalage of the Mughal Empire.

In the war of succession that followed, Man Singha, a son of Raghudev was offered refuge in Namrup by the Ahom king.

The Subahdar of Bengal, Islam Khan I, led an expedition into Hajo alongside the Amil of Sylhet, Muhammad Zaman Karori of Tehran in the early 17th century.

In 1657, Lutfullah Shirazi, the faujdar of Shujabad, built the hilltop mosque in Hajo known as Powa-Makkah Barmaqam.

After the region was cleared of the Mughals, Pratap Singha established Balinarayan, the brother of Parikshit Narayan, as the Raja of Darrang.

The intention of Pratap Singha in installing Balinarayan as a tributary king of Darrang was to create a buffer state between Ahom kingdom and Mughal Empire.

After many battles the Ahoms and Bali Narayan's army finally conquered Hajo and removed their influence from Goalpara.

On the other hand, the Ahoms ruled the eastern part of Darrang (the present Sonitpur) through Kalia Bhomora Borphukan, stationed at Kaliabor.

In 1662 the Mughal general Mir Jumla marched up to Gargaon, the Ahom capital, and set up camp.

Nevertheless, he struck an agreement with the Ahom king that included war indemnities; but he died on his journey back to Dhaka.

The Ahoms again captured Kamrup in 1667, and fended off an entrenched Mughal attack led by Ram Singh in 1671 in the celebrated Battle of Saraighat.

In March 1679, the Ahom viceroy in Guwahati, Laluksola Borphukan, handed over Kamrup to Nawab Mansur Khan, the deputy of Azam Shah, the son of Aurangzeb and the then governor of Bengal.

In the meantime, the influence of the Raja of Darrang decreased, and the Ahoms took possession of Kamrup till the end of their rule.