Passage: The fort was commissioned by Sher Shah Suri, founder of the Sur Empire. The fort was designed to block the advances of Mughal emperor Humayun, who had been exiled to Persia following his defeat at the Battle of Kannauj. The fort occupies a strategic position between the mountainous region of Afghanistan and the plains of Punjab, and was intended to prevent the Mughal emperor from returning to India.The fort was also designed to suppress the local Gakhar tribes of the Potohar region. The Gakhar tribes were allies of the Mughal Empire, and refused to recognize the suzerainty of Sher Shah Suri.

Question: What was the primary purpose of the strategic position?
prevent the Mughal emperor from returning to India