From the Wikipedia page 
Walter was a firm adherent of Warwick "the king-maker", and on 7 November 1460 he was appointed High Sheriff of Staffordshire. Apparently he held the office for the usual term, undisturbed by the varying fortunes of the party. On 26 January 1461–2 he is styled a ‘king's knight,’ and was granted the manors of Ramsham and Penpole, Dorset, formerly belonging to William Neville, 1st Earl of Kent. Grants of the manors of Clynte, Hondesworth, and Mere in Staffordshire, formerly belonging to the Lancastrian James Butler, Earl of Wiltshire, soon followed, and on 14 June 1463 Wrottesley was one of those to whom Warwick was allowed to alienate manors and castles, although their reversion might belong to the crown. Wrottesley joined Warwick in his attempt to overthrow the Woodvilles, and when in 1471 the king-maker restored Henry VI, Wrottesley was put in command of Calais, a stronghold of the Nevilles. After Warwick's defeat and death at Barnet on 14 April, Wrottesley surrendered Calais to Edward IV on condition of a free pardon. He was sheriff of Staffordshire in 1492–3; and William—and three daughters.