After Aurangzeb ascended to the Mughal throne, he appointed one of his generals, Mir Jumla II who had aided him in the war as the Governor of Bengal.

In the northeast of the Mughal Empire, Bengal's expanding export economy and the presence of Muslim settlers created a potential area for aggressive military campaigns.

Concurrently, Jayadhwaj Sinha, the Ahom king, dispatched an army to invade and annex Kamrup, the Mughal border district along the Brahmaputra River.

In acknowledgment of Mir Jumla's commendable service over the past sixteen months despite facing numerous challenges, Aurangzeb decided to appoint him as the permanent Governor of Bengal.

[2] In mid-1660, Aurangzeb, determined to re-establish control over the northeast region, appointed Muhammad Said Mir Jumla, his ally from the Deccan, as the governor of Bengal, Bihar, and Orissa.

During his initial year in office, Mir Jumla overhauled the provincial administration, revived revenue collection, and effectively enforced Mughal authority across all three regions.

He was supported by Qazi Samui Shujai as diwan and Mir Abdur Razzaq and Khwajah Kish or Das Mansabdar as amirs.

[5] By November 1661, Mir Jumla was ready to embark on a campaign described as "a holy war with the infidels of Assam," as reported by his official news correspondent.

[11] Meanwhile, upon hearing the night-long cannonade, Mir Jumla dispatched Muhammad Mumin Beg Ekkataz Khan to assist the beleaguered fleet, particularly the English, Dutch, and Portuguese ships in the Mughal army, which were erroneously reported by a Moorish informer to have been lost.

Due to the lack of habitable areas, unstable ground, dense jungles, and muddy terrain, Muhammad Mumin was unable to reach the fleet during the night.

The timely dispatch of Muhammad Mumin Beg by Mir Jumla to assist the imperiled imperial fleet ultimately tipped the scales in favor of the Mughals.

[15] By March 1662, the Mughal army proceeded inland, leaving the fleet behind, aiming to capture Garghaon, the capital from which the Ahom ruler and his court had fled.

With the onset of the rainy season, Mir Jumla stationed his forces near the capital, while the Ahoms severed the line of Mughal outposts leading back to the Brahmaputra fleet.

From May to October, the Mughal army in the capital and the river fleet at Lakhau endured famine, disease, continuous Ahom assaults, and desertions.

The Ahom ruler agreed to become a Mughal vassal, send a daughter with a dowry for marriage to the imperial court, surrender significant treasure and elephants, and cede extensive territories in Darrang and western districts.

Mir Jumla began organizing a phased withdrawal and the administration of the newly acquired districts, but he fell seriously ill and passed away in March 1663.