The History of Shēr Shāh (Tārīkh-i Shērshāhī) 3.10.p2

3.10.p2

When Humayun had overcome Sultan Mahmud, and had put the greater number of his opponents to death, he sent Hindu Beg to take Chunar from Sher Khan, but Sher Khan declined to give it up to him. When he heard this, Humayun commanded his victorious standards to be set in motion towards Chunar. Sher Khan leaving Jalal Khan (who after the death of Sher Khan succeeded him under the title of Islam Shah), and another Jalal Khan, son of Jalu, in Chunar, withdrew with his family and followers to the hills of Nahrkunda. The army of Humayun besieged Chunar, and daily fighting ensued, in which both Jalal Khans displayed valour great beyond description, and from their gallantry gained great renown. Sher Khan's custom was to despatch spies to all the neighbouring countries, in order to inquire into their actual condition.