Pitt's particular genius was to finance an army on the continent to drain French men and resources so that Britain might concentrate on what he held to be the vital spheres: Canada and the West Indies; whilst Clive successfully defeated Siraj ud-Daulah, (the last independent Nawab of Bengal) at Plassey (1757), securing India. The Continental campaign was carried on by Cumberland, defeated at Hastenbeck and forced to surrender at Convention of Klosterzeven (1757) and thereafter by Ferdinand of Brunswick, later victor at Minden; Britain's Continental campaign had two major strands, firstly subsidising allies, particularly Frederick the Great, and second, financing an army to divert French resources from the colonial war and to also defend Hanover (which was the territory of the Kings of England at this time)