Who was Hari Singh Nalwa, the Sikh warrior who won many battles against Afghans?

GS Paper 1 Topics Covered: Modern Indian history from about the middle of the eighteenth century until the present- significant events, personalities, issues.   Context: Afghanistan, which has earned the name of graveyard of the empires, could not be controlled by anyone completely. But Hari Singh Nalwa, a legendary Sikh commander, tamed the turbulent forces at …