Hari Singh was administered Pahul when grew up and assumed the responsibility of supervising the affairs of his father's jagir. Hari Singh presented himself before Maharaja Ranjit Singh in his open darbar which he used to hold for a week or so on the eve of Basant fair every year. The Maharaja was so impressed by the feats of chivalry shown by him that he was taken in the royal service as a personal khidmatgar or an attendant. Maharaja commissioned him in 1804 A.D. by granted him a command of 700 footmen and horses with the honour of Sardar. Why Hari Singh is called "Nalua" and not Uppal. The reason is that he came to be know by the said title by way of an incident which took place during the early days of his joining the service of Maharaja Ranjit Singh. During the course of hunting expedition he happened to be a victim of a sudden attack of a tiger. The attack was so suttle and unexpected that he did not gain time to pull out his sword. Sardar Hari Singh Nalua faced the crucial situation with such boldness that he managed to catch hold of the jaw of the beast forcefully with his hands and pushed it away with the prowess of arms arranging thus to kill it with his sword. Baron Charles Hugel says he was called Nalua for 'having cloven the head of a tiger who had already seized him as its pray'.