Jahangir responded by jailing the 14 year old Guru Hargobind at Gwalior Fort in 1609, on the pretext that the fine imposed on Guru Arjan had not been paid by the Sikhs and Guru Hargobind. It is not clear as to how much time he spent as a prisoner. The year of his release appears to have been either 1611 or 1612, when Guru Hargobind was about 16 years old. Persian records, such as "Dabistan i Mazahib" suggest he was kept in jail for twelve years, including over 1617–1619 in Gwalior, after which he and his camp were kept under Muslim army's surveillance by Jahangir.