Short answers, pulled from the story.
The Second Battle of Panipat took place on the 5th of November 1556. This battle occurred when a thirteen-year-old Akbar stood eight miles away from the field while Hemchandra fought for the crown of India.
Hemchandra was a former associate of Sher Shah Suri who rose from humble origins in Rewari to become the Chief Minister and General of the Sur army. He crowned himself Vikramaditya just weeks prior to the battle and claimed royal status after taking possession of Delhi on the 7th of October 1556.
The Mughal army defeated Hemchandra's forces by capturing his artillery train and using a deep ravine as a natural barrier to protect their center. The turning point occurred when a chance Mughal arrow struck Hemchandra in the eye, causing his army to panic and flee the field.
Hemchandra was struck in the eye by a Mughal arrow and collapsed unconscious before being captured and beheaded by Akbar. His head was sent to Kabul to be hanged outside Delhi Darwaja, while his body was gibbeted on a gate in Purana Quila, Delhi.
The Second Battle of Panipat marked the end of the Sur Empire's resistance and solidified the Mughal hold over Delhi and Agra. Adil Shah Suri was defeated and killed by Khizr Khan in April 1557, ending the dynasty's ability to challenge Mughal authority.