What were the problems faced by Humayun when he ascended the throne?

When Humayun ascended the throne, the empire was not strong. The Afghan chiefs wanted to oust the Mughals from India; Bahadur Shah, the powerful ruler of Gujarat wanted to expand his empire. Humayun’s brothers Kamran, Hindal and Askari were planning to oust him. Humayun attacked Sher Khan and then Bahadur Shah; captured Chunar fort and provinces of Gujrat and Malwa from them. But later in 1539, he faced defeat at Chausa from Sher Khan. He had to run to save his life. For next 15 years he became a prince without a kingdom and wandered from one place to another in search of shelter.