Sirajuddaulah asked the east india company to stop interfering in the political affairs of his domination,stop fortification,pay revenues.After negotiations failed,the nawab marched with 30,000 soldiers to english factories warehouses etc .Then he marched to calcutta to establish control over companies fort.

on hearing the news of the fall of calcuttta ,company officials in madras sent forces under the command of robert clive. Finally in 1757  Robert clive led the companies army against sirajuddaulah at plassey
battle of plassey became famouse because it was the first major victory of the company in India
It took place on 23 june 1757
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