Major Weaknesses: Loss of Hull & strategic ports, location of King's supporters was too widespread to enable him to concentrate his forces, inability to recruit sufficient forces (forces outnumbered), loss of London, Scottish on Parliamentarian side, Catholicism through Arminianism feared of Charles therefore protestants reluctant to join, foreign forces recruitment undermined Royalist argument that they were fighting for independence and integrity of the nation, Rupert's impulsive nature as a commander weakened the Royalists, Royalist defeat at Naseby and Marstoon Moor.