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Early reign

When Humayun came to the throne of the Mughal Empire, several of his brothers revolted against him after he split the empire among them. Another brother, Hindal Mirza, supported Humayun but was assassinated. The Emperor commenced construction of a tomb for his brother, but this was not yet finished when he was forced to flee to Persia. Sher Shah Suri destroyed the structure and no further work was done on it after Humayun's restoration.

Humayun had two major rivals for his lands: Sultan Bahadur of Gujarat to the southwest and Sher Shah Suri (Sher Khan) settled along the river Ganges in Bihar to the east. Humayun's first campaign was to confront Sher Shah Suri. Halfway through this offensive, Humayun had to abandon it to focus on Gujarat, where a threat from Ahmed Shah had emerged. Humayun was victorious annexing Gujarat, Malwa, Champaner and the great fort of Mandu.

During the first five years of Humayun's reign, Bahadur and Sher Khan extended their rule, although Sultan Bahadur faced pressure in the east from sporadic conflicts with the Portuguese. While the Mughals had obtained firearms via the Ottoman Empire, Bahadur's Gujarat had acquired them through a series of contracts drawn up with the Portuguese, allowing the Portuguese to establish a strategic foothold in northwestern India.

In 1535 Humayun was made aware that the Sultan of Gujarat was planning an assault on the Mughal territories in Bayana with Portuguese aid. Humayun gathered an army and marched on Bahadur. Within a month he had captured the forts of Mandu and Champaner. However, instead of pressing his attack, Humayun ceased the campaign and consolidated his newly conquered territory. Sultan Bahadur, meanwhile escaped and took up refuge with the Portuguese. Like his father, Humayun was a frequent user of opium. In a popular revolt Bahadur Shah recaptured all of Gujarat in 1536 and began an attack on Malwa.