Little is known about the collapse of the Tumlong Palace, the third official capital of the kingdom of Sikkim but the findings of few war-related objects from the ruins of the site have added some exciting tidings. Found from the Palace ruins are cannon balls, musket balls and an iron gear. These objects could probably be looked upon as a new era of warfare that was brought to the Himalayan land of Sikkim by the British. These materials are presently under the preservation of Archives Department, Gangtok.
After Rabdenste, the second capital of Sikkim was repeatedly attacked by the Nepal royal army, Tshudpud Namgyal, the than Chogyal of Sikkim shifted his capital from Rabdenste to Tumlong in 1793. Tumlong was the capital of Sikkim till 1884 when Chogyal Thutob Namgyal shifted his capital to present day Gangtok.