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In page Henry VI of England:

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In 1452, the Duke of York was persuaded to return from Ireland, claim his rightful place on the council, and put an end to bad government. His cause was a popular one and he soon raised an army at Shrewsbury. The court party, meanwhile, raised their own similar-sized force in London. A stand-off took place south of London, with the Duke of York presenting a list of grievances and demands to the court circle, including the arrest of Edmund Beaufort, Duke of Somerset. The king initially agreed, but Margaret intervened to prevent the arrest of Beaufort. By 1453, Somerset's influence had been restored, and York was again isolated. The court party was also strengthened by the announcement that the queen was pregnant.[citation needed]