Lord Dalhousie, as the Governor-General of India from 1848 to 1856, was instrumental in significantly expanding the British Empire's territorial control. His policies of annexation, through the Doctrine of Lapse and direct conquest, extended British dominion to include regions like Punjab and parts of Burma (which extended British influence up to the Irrawaddy River). The Indus River marked the northwestern boundary of British India during his tenure, and his aggressive expansionist policies brought much of the territory between these two rivers under British control.