Q. When was the Battle of Chausa fought?
Answer: 1539
Notes: The Battle of Chausa occurred on 26 June 1539 between Mughal Emperor Humayun and Sher Shah Suri near Chausa in Bihar. Sher Shah's forces attacked during heavy rains, defeating Humayun, who fled the battlefield. This battle resulted in Sher Shah Suri establishing the Sur Empire, temporarily displacing Mughal rule in northern India. The year 1539 is historically confirmed as the date of the battle.