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In page Humayun:

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Shortly after Humayun had marched on Gujarat, Sher Shah Suri saw an opportunity to wrest control of Agra from the Mughals. He began to gather his army together hoping for a rapid and decisive siege of the Mughal capital. Upon hearing this alarming news, Humayun quickly marched his troops back to Agra allowing Bahadur to easily regain control of the territories Humayun had recently taken. In February 1537, however, Bahadur was killed when a botched plan to kidnap the Portuguese viceroy ended in a fire-fight that the Sultan lost. Bahadur's passing caused a power vacuum in Gujarat, which ultimately paved the way for the Mughals to become the region's dominant force.[citation needed]