The Civil War divided the country and families.
'Cavaliers', the gentry of the northern and western areas, were Royalists and supported the king. At the start of the war Charles had better horsemen. Charles also used soldiers from Scotland, Ireland and Wales. Most of the Royalists were conservative Protestants or Catholic.
'Roundheads', the merchants and traders of the south-east and London, supported Parliament. This gave Parliament much more money than the king. Parliament also controlled the navy. Many of the supporters were also Puritan.
Timeline of the war