The Mughal Empire suffered several blows due to invasions from Marathas, Jats, Afghans and Sikhs. In 1737, Bajirao I marched towards Delhi with a huge army. The Marathas defeated the Mughals in the First Battle of Delhi. The Maratha forces sacked Delhi following their victory against the Mughals. In 1739, the Mughal Empire lost the huge Battle of Karnal in less than three hours against the numerically outnumbered but military superior Persian army led by Nader Shah during his invasion after which he completely sacked and looted Delhi, the Mughal capital, followed by massacre for 2 days, killing over 30,000 civilians and carrying away immense wealth including the Peacock Throne, the Daria-i-Noor, and Koh-i-Noor. Nader eventually agreed to leave the city and India after forcing the Mughal emperor Muhammad Shah I to beg him for mercy and granting him the keys of the city and the royal treasury. A treaty signed in 1752 made Marathas the protector of the Mughal throne at Delhi. In 1753 Jat ruler Suraj Mal attacked Delhi. He defeated Nawab of Delhi Ghazi-ud-din (second) and captured Delhi in the Capture of Delhi. Jats sacked Delhi from 9 May to 4 June. Ahmad Shah Durrani invaded North India for the fourth time in early 1757. He entered Delhi in January 1757 and kept the Mughal emperor under arrest. In August 1757, the Marathas once again attacked Delhi, decisively defeating Najib-ud-Daula and his Rohilla Afghan army in the Second Battle of Delhi. Later, Ahmad Shah Durrani conquered Delhi in 1761, after the Third Battle of Panipat in which the Marathas were decisively defeated. Later, a treaty was made between the Marathas and Afghans that the Marathas would have all the lands east of the Sutlej river. Thus, the Marathas established full control over the city. Under the leadership of Jassa Singh Ahluwalia and Baghel Singh, Delhi was briefly conquered by the Sikh Empire in early 1783 in the Battle of Delhi (1783).