Hari Singh Nalwa (1791-1837) was Commander-in-chief of the Sikh Khalsa Fauj, the army of the Sikh Empire. He is known for his role in the conquests of Kasur, Sialkot, Attock, Multan, Kashmir, Peshawar and Jamrud. Hari Singh Nalwa was responsible for expanding the frontier of Sikh Empire to beyond the Indus River right up to the mouth of the Khyber Pass. At the time of his death, the western boundary of the empire was Jamrud.