This decisive battle confirmed British power over Bengal and Bihar after their initial success at the Battle of PlasseyBattle of PlasseyThe Battle of Plassey was a decisive victory of the British East India Company over the Nawab of Bengal and his French allies on 23 June 1757, under the leadership of Robert Clive, which was possible due to the defection of Mir Jafar, who was Nawab Siraj-ud-Daulah's commander in chief.
› wiki › Battle_of_PlasseyBattle of Plassey - Wikipedia in 1757 and marked the end of the attempt to rule Bengal through a puppet nawab.