 Complete the following phrase:  The location of the town at the confluence of two navigable rivers, Ajay and Bhagirathi, made the town strategically important. Katwa was considered the gateway to Murshidabad, the erstwhile capital of the subah of Bengal. Nawab Murshid Quli Khan, Nawab of Bengal, first established a chowki at Katwa during his reign 1717-1727. Between 1742 and 1751, Katwa was invaded by the Bargis break-away Maratha groups several times, as part of the 