The year is 1756, Sirajuddaulah has just been crowned the Nawab of Bengal after Alivardi Khan's death.
The East India Company was provided with exclusive trading rights by the Queen, which resulted in a monopoly. This made the Company keep on a puppet ruler who would grant them special trade privileges
When Sirajuddaulah found out the Company was meddling in political affairs, he asked them to stop. When negotiations failed, he initiated an attack on the English factory in Kassimbar.
ATTACK!!!
The head of the East India Company at the time and Sirajuddaulah's opponent was Robert Clive. On the news of the attack company officials in Madras sent Robert Clive reinforcements.
Robert Clive also managed to get Mir Jafar to betray Sirrajudaulah by promising to make him the Nawab after Sirrajudaulaha's defeat. Sirrajudaulah soon realised that Mir Jafar had betrayed him but his army was tired and there was nothing he could do. This is the main reason for the Company's victory
And so the East India Company claimed its first major victory in India. They appointed Mir Jafar the Nawab of Bengal.