How Far Did Lancastrian Political and Military Mistakes Between 1455 and 1461 Cause the Downfall of the Lancastrians in 1461?

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How Far did Lancastrian Political and Military Mistakes between 1455 and 1461 cause the Downfall of the Lancastrians in 1461? Between 1455 and 1461 the Lancastrian leaders and armies made many political and military mistakes that caused the downfall of House of Lancaster. Some factors and events were major causes, such as the Parliament of Devils, the First Battle of St Albans and the Battle of Northampton, which all helped to put Edward the IV on the throne and end the Lancastrians. In 1455, before, during and after the First Battle of St Albans, Richard Duke of York made no claim to the throne and still promised loyalty to Henry VI. However, Margaret was very hostile to York and pledged to completely destroy York, his family and all his forces. She then became the leader of the Lancastrians as Henry was too weak. In 1459, with the help of the Duke of Buckingham, she managed to persuade Henry that York was plotting against him and therefore should be branded as an enemy of the state. As a result this caused York and Warwick to mobilise their forces and launch a full scale rebellion against Henry and the Lancastrians. This bad political move meant that York had grown in considerable force and had no choice but to fight the Lancastrians, otherwise he would go to prison or even be executed. The result of the First Battle of St Albans was devastating for the Lancastrians and gave an advantage to the Yorkists. Richard Duke of York’s two main rivals, the Duke of Somerset and the Earl of Northumberland, were both killed during the battle and Henry VI was captured by the Yorkists. The Lancastrians and Margaret had lost control of the Kingdom as Henry was now under Yorkist protection. This also meant that when Henry had his second breakdown later in 1455, Richard become Protector of the Realm until 1456 when Henry recovered. This allowed York to spread his influence
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