The 18th century in the Indian subcontinent was characterized by political fragmentation, administrative decay, and the terminal decline of the once-mighty Mughal Empire. While internal contradictions like the Jagirdari crisis, factionalism, and weak successors weakened the empire from within, it was the catastrophic foreign invasion of Nadir Shah in 1739 that dealt the definitive, shattering blow to Mughal prestige.
For the UPSC Civil Services Examination (GS Paper I - Modern Indian History), Nadir Shah's invasion is analyzed not merely as a military raid, but as a critical geopolitical watershed. It exposed the military impotence of the Mughals, drained the imperial treasury, dismantled the natural northwestern defense barrier, and created a political vacuum that directly facilitated the rise of regional powers and the eventual colonization of India by the British East India Company.
Persia under Nadir Shah
To understand the invasion of 1739, it is essential to examine the dramatic rise of Persia under Nadir Shah, often styled by historians as the "Napoleon of Persia" or the "Second Alexander".
- Humble Beginnings to Sovereign Power: Born Nadir Qoli Beg into the pastoralist Afshar tribe of Khorasan, he rose through sheer military genius. During a period when Persia was fragmented and occupied by Hotaki Afghans, Ottomans, and Russians, Nadir mobilized a formidable military force, expelled the occupiers, restored the territorial integrity of Persia, and deposed the Safavid dynasty to crown himself Shah in 1736, founding the Afsharid Dynasty.
- The Persian Military Machine: Nadir Shah revolutionized the Persian military by focusing on mobile warfare, disciplined standing infantry, and advanced gunpowder technology. His army was equipped with:
- Jazails: Heavy, long-range muskets that outperformed the standard matchlocks of contemporary Indian armies.
- Zamburaks: Light, camel-mounted swivel guns that provided rapid, mobile artillery support.
- Economic Motives: Decades of constant warfare had completely bankrupt the Persian treasury. Nadir Shah required vast financial resources to pay his restive troops, maintain his large standing army, and fund his ongoing campaigns against the Ottoman Empire. The legendary, accumulated wealth of the Mughal Empire in India presented the most logical and lucrative target.
Causes of the Invasion
Nadir Shah’s march toward Delhi was not a sudden decision; it was triggered by a combination of Mughal geopolitical neglect, diplomatic blunders, and internal court intrigues.
1. Neglect of the North-West Frontier
Historically, the security of the Indian plains depended on the strict control of the Hindu Kush and the Khyber Pass. However, under the weak later Mughal rulers—specifically Muhammad Shah 'Rangila' (1719–1748)—the administration of the northwestern frontier was completely neglected.
- Financial Embezzlement: The annual subsidies historically paid to the frontier tribes (such as the Afridis and Pashtuns) to guard the passes were stopped or embezzled by corrupt officials in Delhi.
- Incompetence of the Governor: Nasir Khan, the Mughal governor of Kabul and Peshawar, was incompetent and left the border posts unmanned and unpaid. When he petitioned Delhi for reinforcements and funds to defend Kabul, the pleasure-loving court of Muhammad Shah ignored his pleas.