Mir Jumla, in the meantime, took possession of Koch Bihar (Pran Narayan having fled to Bhutan) and began his march against the Ahoms on January 4, 1662.

Koch Behar was occupied in about one month and a half and making administrative arrangements there, Mir Jumla came to join the advance party towards Kamrup.

Mir Jumla took 12,000 cavalry, 30,000 infantry, and a fleet of 323 ships and boats up river towards Assam—the naval contingent comprised Portuguese, English, and Dutch sailors.

Mir Jumla now transferred his entire army south and reached Simalugarh at the end of the month and overran it with some effort.

[7] from this campaign, Mir Jumla has manage to capture 100 elephants, 300000 coins, 8000 shields, 1000 ships, and 173 massive rice stores.