On 11 August 1740 A.D. they dressed up as landlords from Patti and entered the city of Amritsar. They reached Harmandir Sahib and then tied their horses to the berry tree and went inside Harmandir Sahib carrying the bags. Massa Ranghar was smoking shisha and watching dancing girls. The Sikhs threw the bags under Massa's bed and said that they had come to pay the revenue. Massa bent downwards to have a look at the bags. Mehtab Singh immediately took his sword and slashed it at Massa's neck and instantly severed his head. Sukha Singh finished off the guards of Massa Ranghar. They put Massa's head in a bag and rode their horses back to Talwandi Sabo the same evening. The next day they reached Bikaner and presented Massa Ranghar's head on a spear to the congregation of Sikhs.
Death
In 1745, Mehtab Singh was captured by the Mughals after being pursued by them for five years after being given intel on his whereabouts by a spy named Harbhagat Niranjania. Bhangu was crushed to death on the spikes of wheel at Lahore in 1745 on the orders of Zakaria Khan. He was martyred alongside Taru Singh, who was scalped alive.