 In December 1460 Walter Devereux accompanied Edward, Earl of March, to Wales to raise an army to counter a Lancastrian rebellion led by the Tudors.On 30 December, Richard, 3rd Duke of York, was killed at the Battle of Wakefield, and a Lancastrian army moved south towards London.Devereux fought on behalf of Edward, now the 4th Duke of York, at his victory in the Battle of Mortimer's Cross on 2 February 1461, and commanded his left wing.