In the meantime, there arose a chaotic condition in Oudh due to the serious upsurge of the Hindus. Iltutmish sent his eldest son Nasiruddin Mahmood to quell down the rebellion. Supposing that it would take time for the prince to attack Bengal due to his preoccupations in Oudh, Iwaz marched towards eastern Bengal in 1227 AD leaving his capital unprotected.