With York's death, his titles and claim to the throne descended to Edward of March, now 4th duke of York. He sought to prevent Lancastrian forces from Wales, led by Owen Tudor and his son Jasper, Earl of Pembroke, from joining the main body of the Lancastrian army. After spending Christmas in Gloucester, he began to prepare to return to London. However, Jasper Tudor's army was approaching and he changed his plan; to block Tudor from joining the main Lancastrian force which was approaching London, Edward moved north with an army of approximately five thousand men to Mortimer's Cross. Edward defeats the Lancastrian force.