He was once belong from Thapa Chhetri Tribe and a son of Ramdhoj Thapa, a everlasting resident of Ghalechap of Tanahu, Nepal. Thapa enlisted in the British Indian Army on 20 November 1942 and was once a 22-year-old rifleman in the 1st Battalion of the ninth Gurkha Rifles in the course of World War II, when the following deed took vicinity at the Battle of San Marino, for which he used to be awarded the VC.
His quotation in the London Gazette reads:
On 18/19 September 1944 at San Marino, Italy, when a corporation of the ninth Gurkha Rifles encountered bitter opposition from a German organized position, Rifleman Sher Bahadur Thapa and his area commander, who was once afterwards badly wounded, charged and silenced an enemy machine-gun. The rifleman then went on by myself to the uncovered phase of a ridge where, ignoring a hail of bullets, he silenced extra machine-guns, protected a withdrawal and rescued two wounded guys earlier than he was once killed.
His Victoria Cross is presently held by way of his regiment 9 Gorkha Rifles.