The objective of this article is to bring critical attention to the disintegration of England in Henry VI, Part 1 that results from the dissension among the nobles at Henry's court. Compared to the solidarity founded on Protestant faith and patriotism in John Foxe's Acts and Monuments, often referred to as his Book of Martyrs, and in Queen Elizabeth's speech delivered to the Tilbury camp in 1588, the heroism and chivalry associated with England's army in William Shakespeare's play are produced through depictions of French enemies as deceitful, unchaste, and even heretical. Instead of treating the Dauphin Charles, Joan of Arc, Margaret of Anjou as primary opponents, internal factors that aggravate conflict in England are examined. The House of York's use of genealogy, mockingly mirrored in a later scene featuring Joan's fabricated ancestry, divides Henry's court; William de la Pole, the Earl of Suffolk, forsakes England's territories when he negotiates the marriage alliance between Henry and Margaret. Through analyses of Henry VI, Part 1 and historical evidence on Henry VI, this study proves that disputes and ambition extensively corrupt England during and after the Hundred Years' War with France.