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In page Battle of Wakefield:

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According to the pro-Yorkist Annales, York's scouts clashed with the Lancastrians on 16 December, at Worksop in Nottinghamshire. If this event happened it was, at best, a minor skirmish, but by the terms of an act passed in Parliament just prior to York's departure from London, it would have constituted an act of treason against the heir to the throne.[citation needed]