The troubles between Siraj-ud-daulah and the British led to the Battle of Plassey. First, the British had strengthened the fortification around the Fort William without telling the Nawab. Secondly, they abused the trade privileges granted to them by the Mughal rulers, which caused heavy loss of customs duties for the government. Third, they gave shelter to some of his officers, for example Krishnadas, son of Rajballav, who fled Dhaka after misappropriating government funds. Hence, when the East India Company started further enhancement of military preparedness at Fort William in Calcutta, Siraj asked them to stop. The Company did not stop, so Siraj-ud Daulah retaliated and captured Kolkata (Shortly renamed as Alinagar) from the British in June 1756. The Nawab gathered his forces together and took Fort William.