Our last glimpse of him was in 1455, when he was said to have "valiantly performed" the duel on Clyst-Heath, with Thomas Courtenay, Earl of Devon, the real basis of which quarrel it is inferred, but not authenticated, was his presumed sympathy then with the cause of the White Rose, and so raised the anger of his antagonist, who was warmly interested on the side of the Red. Apart from this rather apochryphal incident, there does not appear to be any direct evidence of his identification, at least actively, with the cause of York for the next five years. There were reasons why perhaps this might not be so. He was then married to his second wife, a Courtenay, the member of a family strongly identified with the fortunes of the Red Rose. She was the widow of a wealthy peer, and her present husband's son was married to the heiress of her first husband's house, in the person of her niece, the only daughter of his brother; and there does not appear to be any evidence as to which way the Haringtons leant toward the impending struggle, that may have influenced him. Lord Bonville may from conviction have passively inclined toward the interest of York, but no mention is made of his being at the first battle of St. Albans (which took place the same year as the duel on Clyst-Heath) 22 May, 1455, nor as to his being in any way concerned with the fluctuating aspects of the strife during the next four years, up to and including the battle of Bloreheath, which occurred 23 Sep., 1459. But about 1458-9 a new and very powerful factor found admission into Lord Bonville's family, in the marriage of his grandson with Katharine Nevill, the sister of the king-maker, Richard, Earl of Warwick, the central point around which the hopes of the White Rose concentrated, while her other brother George Nevill presided over the diocese of Exeter. It is difficult to estimate the important influence this relationship would naturally exercise on the Bonvilles, especially if already inclined that way, and doubtless it did add considerable weight to turn the scale promptly, and as it turned out irremediably, on the side of York, as immediate events shew. Taking the foregoing speculations and surmises, however, only for what they are worth, by the middle of the year 1460, there could be no doubt as to the side Lord Bonville had taken, whether by the "subtile insinuations" of his grandson's wife's family or otherwise. The battle of Northampton took place 10 July, 1460, and the unfortunate half-demented Henry VI. being taken prisoner, we are told by Prince, with probable correctness, the king was, "among others, committed to the care and custody of the Lord Bonvil." Doubtless afterward, Lord Bonville, accompanied by his son and grandson, found distinguished places in the retinue of the king-maker, in their triumphal march back to London, escorting the captive monarch in the train.