Wars of the Roses
York's attempt to take the throne

Meanwhile, as Henry attempted in vain to secure peace in England, Warwick, in disregard of royal authority, had conducted attacks against the Castilian fleet in May 1458, and against a fleet of the Hanseatic League a few weeks later. His position in Calais also enabled him to establish relations with Charles VII of France, and Philip the Good of Burgundy, international connections that would serve him in the future. In response to the attacks, Warwick was summoned to London to face inquiries along with York and Salisbury. However, fearing arrest once they were isolated from their allies, they refused. York instead summoned the Nevilles to rendezvous at his stronghold of Ludlow Castle in the Welsh Marches; Warwick departed Calais with a portion of the garrison there to join the main Yorkist forces.

Margaret had not been idle during this time and had been actively recruiting armed support for Henry, distributing a livery emblem of a silver swan to knights and squires enlisted by her personally. Before Warwick could join them, the Yorkist army of 5,000 troops under Salisbury was ambushed by a Lancastrian force twice their size under James Tuchet, 5th Baron Audley at Blore Heath on 23 September 1459. The Lancastrian army was defeated, and Baron Audley himself killed in the fighting. In September, Warwick crossed over into England and made his way north to Ludlow. At nearby Ludford Bridge, the Yorkist forces were scattered due to the defection of Warwick's Calais troops under Andrew Trollope.

Forced to flee, York, who was still Lieutenant of Ireland, left for Dublin with his second son, Edmund, Earl of Rutland, while Warwick and Salisbury sailed to Calais accompanied by York's heir, Edward, Earl of March. The Lancastrian faction appointed the new Duke of Somerset, Henry Beaufort to replace Warwick in Calais, however, the Yorkists managed to retain the loyalty of the garrison. Fresh from their victory at Ludford Bridge, the Lancastrian faction assembled a " Parliament of Devils " at Coventry with the sole purpose of attainting York, his sons, Salisbury, and Warwick, however, the actions of this assembly caused many uncommitted lords to fear for their titles and property. In March 1460, Warwick sailed to Ireland under the protection of the Gascon Lord of Duras to concert plans with York, evading the royal fleet commanded by Henry Holland, 3rd Duke of Exeter, before they returned to Calais.

In late June 1460, Warwick, Salisbury, and Edward of March crossed the Channel and rode north to London, where they enjoyed widespread support. Salisbury was left with a force to besiege the Tower of London, while Warwick and March pursued Henry northward.

The Yorkists caught up with the Lancastrians and defeated them at Northampton on 10 July 1460. Humphrey Stafford, 1st Duke of Buckingham, John Talbot, 2nd Earl of Shrewsbury, John Beaumont, 1st Viscount Beaumont, and Thomas Percy, 1st Baron Egremont were all killed defending their king. For a second time, Henry was taken prisoner by the Yorkists, who escorted him to London, compelling the surrender of the Tower garrison.

That September, York returned from Ireland, and, at the Parliament of October that year, he made a symbolic gesture of his intention to claim the English crown by placing his hand upon the throne, an act which shocked the assembly. Even York's closest allies were not prepared to support such a move. Assessing York's claim, the judges felt that common law principles could not determine who had priority in the succession, and declared the matter "above the law and passed their learning". Finding a lack of decisive support for his claim among the nobility who at this stage had no desire to usurp Henry, a compromise was reached: the Act of Accord was passed on 25 October 1460, which stated that following Henry's death, his son Edward would be disinherited, and the throne would pass to York. However, the compromise was quickly found to be unpalatable, and hostilities resumed.
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