The Battle of Chausa was a notable military engagement between the Mughal Emperor, Humayun, and the Afghan warlord, Sher Shah Suri. It was fought on 26 June 1539 at Chausa, 10 miles southwest of Buxar in modern-day Bihar, India. Sher Shah Suri was assisted by his allies, the Ujjainiya Rajputs of Bhojpur who were led by the commander, Gajpati Ujjainia.