He took-over the leadership role of the Budha Dal after
Binod Singh was killed in a clash against Mughal forces in 1721. However, another sources states Kapur Singh joined Darbara Singh's jatha in June 1726. After the last-stand and
martyrdom of
Tara Singh Wan in 1726, many Sikhs, motivated by feelings of revenge, decided to join the jatha of Darbara Singh to fight the Mughals. Under the leadership of Darbara Singh, the Sikhs managed to reorganize and reconvene themselves after being in disarray since the death of Banda Singh Bahadur. He did so by arranging a
Sarbat Khalsa in 1726 in
Amritsar. After a Gurmatta passed under his watch, the Mughal imperial treasury was targeted for looting by the Sikhs. In 1733,
Zakariya Khan, the
governor of
Lahore province, attempted to make peace with the Sikhs and sent an envoy named Subeg Singh to meet with them. However, the Sikh congregation overruled Darbara Singh's protest and decided to confer the title upon Kapur Singh instead, whom was also a highly-respected Sikh at the time. == Death and succession ==