The Battle of Chausa was a notable military engagement between the Mughal emperor, Humayun, and the Afghan, Sher Shah Suri. It was fought on 26 June 1539 at Chausa, 10 miles southwest of Buxar in modern-day Bihar, India. Humayun escaped from the battlefield to save his life. Sher Shah was victorious and crowned himself Farīd al-Dīn Shēr Shah. The Emperor survived by swimming across the Ganges using an air-filled "water skin", and quietly returned to Agra. Humayun was assisted across the Ganges by Shams al-Din Muhammad.