Britannica Sources used in this answer

How did Humayun lose the Mughal Empire to Sher Shah of Sur?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Mughal emperors Jahangir, Akbar, and Shah Jahan — Mughal dynasty Emperors (from left, seated) Jahangir, Akbar, and Shah Jahan are depicted with their ministers (foreground) and Prince Dara Shikoh in a watercolor from India, c. 1630–40.

Humayun’s loss of the Mughal Empire to Sher Shah of Sur was the result of both military defeats and systemic political vulnerabilities.

Humayun became entangled in a conflict with Sher Khan (later Sher Shah) after failing to subdue the fortress of Chunar. While Humayun was occupied in Bengal, his lines of communication to Delhi and Agra were severed, and his brother Hindal began acting as an independent ruler, forcing Humayun to abandon his position.1

The decisive military turning points were:
* Battle of Chausa (1539): Sher Shah defeated Humayun, significantly weakening his position.21
* Battle of Kannauj (1540): Humayun suffered a final defeat against Sher Shah, forcing him to retreat and eventually flee to Iran to seek military aid.21

Humayun’s failure was also rooted in the inherent flaws of early Mughal political organization. The nobility’s loyalty was divided among various chiefs, and royal family members frequently challenged the emperor’s authority, creating internal instability that Sher Shah—a skilled military and political strategist—exploited effectively.1