The Battle of Plassey took place on 23 June 1757, and was a victory for the British East India Company over the Nawab of Bengal and the French.
The battle took place on the banks of the Bhagirathi River in Palashi, Bengal, and was precipitated by an attack on Calcutta by the Newab of Bengal. Colonel Robert Clive led reinforcements from Madras and recaptured Calcutta, before taking the French fort of Chandernager. Outnumbered by the Newab's forces, the British forged a plot with some of his chiefs, who assembled their armies, but then purposefully did not send them in to fight.
This British victory allowed them to force the Dutch and the French out of South Asia, and establish dominance in the region for around 200 years.