Explanation:

=> Mughal army under Mir Jumla invaded Assam in the year 1662.

=> The Mughals defeated Ahoms, captured Ahom territory including Guwahati.

=> Treaty of Ghilazarighat was signed in the year 1663

=> Jayadhwaj Singha died out of despair in 1663, and he was succeeded by his cousin Chakradhwaj Singha.

=> Chakradhwaj Singha appointed Lachit, the son of Momai Tamuli Barbarua, to command the expedition against the Mughals and appointed him the Borphukan.