did not attend York's victory parliament in 1455, and might have gone on pilgrimage: he is known to have walked to Walsingham in 1456, and over the next two years may have travelled to Amiens, Rome or even Jerusalem. After four years' peace, the civil war resumed in September 1459 when the Yorkist Earl of Salisbury fought off a royal ambush at the Battle of Blore Heath. Salisbury won that battle but was defeated soon after with the Duke of York at the Battle of Ludford. The Yorkists escaped into exile. Mowbray had taken neither side, but with the Yorkists exiled, when a parliament was called at Coventry, Mowbray attended. Here the Yorkists were attainted, and on 11 December 1459 Mowbray took an oath of loyalty to keep Henry VI on the throne. He received several royal commissions in the final months of Lancastrian rule. The Nevilles and Earl of March spent their exile in Calais, while York and his other son, Edmund, Earl of Rutland, retired to Dublin. The Nevilles returned to England in June 1460. They were admitted into London, where they could plan an assault on the King's army, then based in Northampton. On 10 July the Yorkist army under Warwick and March defeated the royalist army at the Battle of Northampton, and once again the King was captured. Colin Richmond describes Mowbray as "more likely to have observed from a safe distance than participated" in it. York returned from exile in October 1460, and much to the frustration of his allies, made claim to the throne. Mowbray's reaction is uncertain as the chroniclers omit mention of him, but some historians note how Mowbray sided with them during the Yorkists' return from exile. The exact cause of his change of loyalty is unknown. Colin Richmond argues that the Lancastrian defeat at Northampton in June 1460 was fundamental, and Mowbray lost friends and colleagues. It is possible that King Henry's capture there encouraged him to desert the King. Christine Carpenter puts it down almost solely to Mowbray's failure to improve his position in Norfolk under Henry, while Castor points to the October 1460 Yorkist parliament being the turning point for Mowbray: possibly he believed that the attempted settlement contained in the Act of Accord was the best possible outcome. The King and Queen still had the support of much of the nobility and withdrew to the north to