Dhar played a sterling role in assisting the Indian Army during the Indo-Pakistani War of 1947. He helped the Indian officers interact with the population and collect porters, mules and other kinds of administrative help which made the soldiers' jobs much easier.
He negotiated the 1971 Indo-Soviet Treaty of Friendship and Cooperation and was a principal architect of India's military intervention in neighboring East Pakistan's civil war, which led to the creation of independent Bangladesh.