Sardar Mahan Singh, 3rd Misldhar of the Sukerchakia misl 1772/1790, he built a fortress which he named Garhi Mahan Singh within the walled town of Gujranwala and increased the number of horsemen to 6,000, he then captured Rasulnagar from the Chatthas, and took Pindi Bhattian, Sahiwal, ‘Isakhel and Jhang, in 1782, he sacked Jammu and came away with much booty, married 1stly, 1774, Sardarni Raj Kaur, a daughter of Raja Gajpat Singh of Jind, married 2ndly, Bibiji Mai Kaur, daughter of Jai Singh Mann of Mogalchak, and had issue. He died 1790.
As the new leader of the Sukerchakia Misl he captured the Rohtas Fort from Nur ud-Din Bamezai, a general of Ahmad Shah Durrani. With the help of Jai Singh Kanheya he laid a four-month siege to Rasool Nagar and captured the city from Pir Mohammed, its Chattha leader. The reputation he gained as a result of the siege led to Sardars loyal to the Bhangi Misl defecting to him He continued to expand his territory and captured Pindi Bhattian, Sahiwal, Isakhel, Kotli Loharan, and Jhang. In 1784-5, He used a feud between rulers to raid Jammu, but because he gained a great degree of wealth without sharing or informing his partner Jai Singh Kanheya, Jai Singh refused his attempts to reconcile. Mahan Singh then created an alliance with Jassa Singh Ramgarhia and defeated the Kanheya Misl at the Battle of Batala. During the Battle Jai Singh Kanheya’s son and successor, Gurbaksh Singh Kanheya, was killed. His widow, Sada Kaur betrothed her daughter to Ranjit Singh, Singh’s Son. Sada Kaur would later succeed to the leadership of the Kanheya Misl and aided Ranjit Singh in his early victories. According to the Gujrat District gazetteer 1921 Mahan Singh was one of the chiefs of the Chatha Jatt tribe.
During the siege of Sodhra, which was being occupied by the Bhangi Misl, he contracted dysentry and died in April 1790.