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In page Henry VII of England:

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Henry devised a plan to seize the throne by engaging Richard quickly because Richard had reinforcements in Nottingham and Leicester. Though outnumbered, Henry's Lancastrian forces decisively defeated Richard's Yorkist army at the Battle of Bosworth Field on 22 August 1485. Several of Richard's key allies, such as Henry Percy, 4th Earl of Northumberland, and also Lord Stanley and his brother William, crucially switched sides or left the battlefield. Richard III's death at Bosworth Field effectively ended the Wars of the Roses.[citation needed]