The Battle of Karnal, in 1739 was the supreme triumph of Nadir Shah, the great Persian king and military commander. At Karnal, in northern India, the Persians comprehensively crushed the Mughal emperor Muhammad Shah’s larger army, going on to sack their capital, Delhi.
Nadir Shah’s victory at the Battle of Damghan in 1729 had consolidated his control of Persia, and he became king in 1736. After successfully invading Afghanistan in 1738, he advanced into the Mughal Empire, which had been seriously weakened by wars and internal strife. The Mughal army was encamped near Karnal, north of Delhi.
On 24 February, the Persians advanced toward Karnal, and the Mughals sent a force to meet them, including several war elephants. The Mughal front was more than 2 miles (3.2 km) long, and the same depth. It was to prove no match for Nadir Shah’s disciplined army. The Persians waited until the Mughal came within close range and unleashed devastating volleys of gunfire, with the elephants providing especially easy targets. The Mughals lost two of their chief commanders: Khan Dauran was seriously wounded and forced to retire (he died the next day) and Sa’adat Khan was pulled from his elephant and captured. After two hours, the Mughal lines quickly began to fall apart and the soldiers fled back to their camp.
The battle swiftly became a rout. The Persians pursued and were able to capture Muhammad Shah. Nadir Shah’s army advanced to Delhi and looted the city, capturing a great fortune in jewels and precious metals before returning to Persia. Muhammad Shah remained on the throne, but Karnal and its consequences were hugely damaging to the prestige of the Mughal Empire, whose decline quickly became terminal. —Britannica