On 12th/3th June 1999, Havildar Sultan Singh Nanvaria was the section commander of Number One Section, which was tasked to capture area Rock of Point 4590 in the Drass sector during 'Operation Vijay'. The success of the company attack hinged on his ability to capture area Rock and establish a foothold on the feature. After having deployed the fire support base, Havildar Nanvaria attempted to approach area Rock from a flank. The enemy holding area Rock in strength readjusted itself to bring down effective fire on him and his section

Despite heavy odds of attacking up hill at 15,000 feet, against accurate enemy small arms fire, Havildar Nanvaria fearlessly pressed on. At this stage, he ordered his section to assault area Rock and he himself rushed towards the enemy medium machine gun, blazing away his weapon. When his ammunition ran out, he charged on to the medium machine gun taking the complete fire on to himself and neutralized the medium machine gun before succumbing to his injuries. Inspired by his gallant action and supreme sacrifice the section assaulted area Rock and captured it.

Havildar Sultan Singh Nanvaria displayed gallantry of the highest order and made the supreme sacrifice.