Why did the British take upon themselves the task of town planning from the early years of their rule in Bengal?
Concern for Defence : The British adopted the task of town-planning as they needed defence against local rulers. Sirajudaula, the Nawab of Bengal, attacked Calcutta in 1756. He sacked the small fort, built by the Englishmen, to keep their goods. The traders of the East India Company always questioned the sovereignty of the Nawab. They were not ready to pay customs duties. So Sirajudaula wanted to assert his authority.
Construction of Another Fort:
Sirajudaula was defeated in the Battle of Plassey in 1757. So East India Company decided to build a new fort which should be invincible and impregnable. It was named as Fort William.