Gurudwara Tambu Sahib, near the southeastern corner of the sarovar, marks the spot where the muktas took position behind trees and shrubs which they camouflaged to look like tents {tambu, in Punjabi). The present building, which replaced the old one built at the initiative of Maharaja Mohinder Singh of Patiala (1852-76), was constructed through karseva during the 1980's. It comprises a high ceillinged domed hall, with a gallery at mid height and the sanctum in the centre.

When 40 Sikhs under the command of Mata Mai Bhago arrived at 'Khidarane Dee Dhab' (now Mukatsar) they took positions at this place behind the trees and shrubs. They placed Cloth-sheets on the shrubs and trees and made them look like tents (in Punjabi Tambu), hence the name of the Gurdwara. They made these tents so that the enemy should think that a very large Sikh Army is present at this place. After winning the battle, Tenth Sikh Guru, Shri Guru Gobind Singh Ji also put up his tent at this place.