Mal. During one massive assault, Jats sieged Agra in 1761, after 20 days on 12 June 1761 the Mughal forces at Agra surrendered to Jats. Jats plundered the city and carried the bounty, including the two great silver doors to the entrance of the famous Taj Mahal. which were carried off and melted down by Suraj Mal in 1764. Suraj Mal's son Jawahar Singh, further extended the Jat power in Northern India and captured the territory in Doab, Ballabgarh and Agra. Jats kept Agra fort and other territories closer to Delhi under their control from 1761 till 1774 CE. Sikh Victories Sikhs had been in perpetual war against Mughal intolerance specially after beheading of the Sikh Guru - Guru Teg Bahadur by the Mughals. Simmering Sikhs rose once again in the year 1764 and overran the Mughal Faujdar of Sirhind, Zain Khan Sirhindi, who fell in battle and ever since the Sikhs perpetually raided and took the bounties from the lands as far as Delhi practically every year. The Marathas took Delhi in 1771 before Shah Alam II arrived. Mirza Najaf Khan had restored a sense of order to the Mughal finances and administration and particularly reformed the Mughal Army. In 1777 Mirza Najaf Khan decisively defeated Zabita Khan's forces and repelled the Sikhs after halting their raids. In 1778, after a Sikh incursion into Delhi, Shah Alam ordered their defeat by appointing, the Mughal Grand Vizier, Majad-ud-Daula marched with 20,000 Mughal troops against the Sikh army into hostile territories, this action led to the defeat of the Mughal Army at Muzzaffargarh and later at Ghanaur, due to the mounted casualties Shah Alam II reappointed Mirza Najaf Khan, who soon died of natural circumstances leaving the Mughal Empire weaker than ever. In the year 1779, Mirza Najaf Khan carefully advanced his forces who successfully routed the treasonous Zabita Khan and his Sikh allies who lost more than 5,000 men in a single battle and never returned to threaten the Mughal Empire during the commander Mirza Najaf Khan's lifetime. Najaf Khan as prime minister, granted sovereign rights to the Sikhs as agreement. In the year 1783, Farzana Zeb un-Nissa had saved Delhi from a possible invasion by a force of 30,000 Sikh troops, under Baghel Singh, Jassa Singh Ramgarhia and Jassa Singh Ahluwalia. Mughal empire disintegrated to such an extent that Shah Alam II was only left with Delhi city to