Sirajudaula, the Nawab of Bengal in 1756, sacked the small fort from Britisher. In this fort the British traders had built to house their goods. Consequently, when Sirajudaula was defeated in the Battle of Plassey, the British built a new fort, Fort William which could not be easily attacked. Around this a vast open space was left. This open space ' was called the Maidan or garermath_ This was done for security reasons, because there would be no obstructions to a straight time of fire from the Fort against an advancing enemy army. Soon the British began to move out of the Fort. They built residences along the periphery of the Maidan_ This indicates that how the English Settlement in Calcutta began to take shape. The vast open space around the Fort William became the significant town planning measure in Calcutta (Now Kolkata). Lord Wellesley was more concerned about the conditions that existed in the cities. Cities were overcrowded, and had no sanitation facilities. He issued an administrative order in 1803 on the need for town planning and set up various committees for this purpose open places in the city would make the city healthier. As a result of this, many bazaars, ghats, burial ground and tanneries were cleared or removed After Wellesley's departure, the Lottery Committee carried on with the work of town planning in Calcutta.