Nadir Shah and the Sack of Delhi

Battle of Karnal, 1739 — this battle is the one most often confused with the Panipat trio, and the exam exploits that confusion directly: it is fought barely 70 km from Panipat, in the same Haryana corridor, but is a wholly separate event with a wholly different outcome. The Persian ruler Nadir Shah (of the Afsharid dynasty, having already conquered the crumbling Safavid and Afghan lands), invaded the weak and divided Mughal Empire under Muhammad Shah "Rangila," whose court was riven by factional intrigue and whose army — though numerically far larger — was poorly coordinated and technologically outdated compared to Nadir Shah's battle-hardened Persian musketeers and cavalry. At Karnal, Nadir Shah's forces routed the Mughal army within a few hours, and Muhammad Shah was left with no option but to personally escort Nadir Shah into Delhi. What followed was catastrophic: a rumour of Nadir Shah's death triggered rioting in Delhi, and in retaliation Nadir Shah ordered a general massacre in which tens of thousands of Delhi's residents were killed, before extracting an immense indemnity in cash and jewels — including the fabled Peacock Throne and the Koh-i-Noor diamond, both carried back to Persia. The longer-term consequence was fatal to Mughal prestige rather than to Mughal territory: Karnal exposed the empire's military hollowness to the entire subcontinent, directly emboldening the later invasions of Ahmad Shah Abdali (who had served under Nadir Shah) and accelerating the rise of regional successor states — Awadh, Bengal, Hyderabad, and the Marathas — who increasingly ignored Delhi's authority thereafter.

Memory hook: "Karnal broke the throne; Panipat broke the field." Karnal (1739, Nadir Shah) humiliates the Mughals and empties their treasury; the later Third Battle of Panipat (1761, Abdali) is a different invader, a different war, fought over Maratha rather than Mughal power — never merge the two into one event.

Peg for the name itself: "Karnal" → picture a car stalling and rolling backward down a hill — Karnal is where the Mughal "engine" of empire visibly stalled out, in full public view, for the first time.