Major Hoshiar Singh was born on 5th May 1936 in village Sisana, district Rohtak ,  Haryana. Sisana is a big village on Rohtak - Sonipat road, about 25 km from Sonipat. This Jat dominated village has produced more than 250 soldiers for the Indian Army. His father was a respectable farmer and his mother Smt. Mathuri Devi, a kind-heated housewife. Col Hoshiar Singh got married to Smt Dhanno when he was still studying in the 7th class. This illustrious couple has three sons. After his schooling and one year's study at the Jat College, Rohtak, he joined the Indian Army as a soldier.  He married Dhanno when in was in seventh standard. They had 3 sons.

(1936 – 1998) to Choudhary Hira Singh. He served in the Indian Army with dedication, retiring as a Brigadier. He passed away on 6 December, 1998 of natural causes. He joined army after doing his schooling and one year of college. On 30th June 1963 Hoshiar Singh was commissioned in the Grenadiers Regiment. His first posting was in NEFA. he saw some action in the Rajasthan sector in the 1965 Indo-Pakistan war.

During 1971 indo-pak war, 3rd Grenadiers was given the mission to build a bridgehead across the Basantar River in the Shakargarh Sector 15th – 17th December. The river was well fortified by enemies and covered with deep minefields on both sides.  Major Singh was in command of the  ‘C' Company. His orders were to capture Jarpal. Enemy forces reacted quickly and came up with sharp counter attack. Major Singh went from trenches to trenches motivation his men to fight bravely. It was so effective that company was able to fail the Pakistani attack causing heavy causalities on the Pakistani forces.  In spite of being seriously injured Major Singh refused to leave the battlefield till the enemy ceasefire.

Throughout this operation, Major Singh displayed the most conspicuous gallantry, grim determination and indomitable spirit. With grit, courage and complete disregard to his personal safety he inspired his command to perform outstanding acts of gallantry and defeated repeated enemy attempts to recapture the locality. The steadfastness and dauntless courage displayed by Major Hoshiar Singh were in keeping with the highest traditions of the Indian Army.

Major Hoshiar Singh was awarded with the highest wartime gallantry medal, the Param Vir Chakra for his leadership, conspicuous gallantry and indomitable fighting spirit Which was in keeping with  the highest traditions of the Indian Army.