First English Civil War: Battle of Turnham Green: The Royalist forces withdraw in the face of the Parliamentarian army and fail to take London.

The First English Civil War took place in England and Wales from 1642 to 1646, and forms part of the 1639 to 1653 Wars of the Three Kingdoms. An estimated 15% to 20% of adult males in England and Wales served in the military at some point between 1639 and 1653, while around 4% of the total population died from war-related causes. These figures illustrate the widespread impact of the conflict on society, and the bitterness it engendered as a result.

The Battle of Turnham Green took place on 13 November 1642 near the village of Turnham Green, at the end of the first campaigning season of the First English Civil War. The battle resulted in a standoff between the forces of King Charles I and the much larger Parliamentarian army under the command of the Earl of Essex. In blocking the Royalist army's way to London immediately, however, the Parliamentarians gained an important strategic victory as the standoff forced Charles and his army to retreat to Oxford for secure winter quarters.

The term Cavalier was first used by Roundheads as a term of abuse for the wealthier royalist supporters of Charles I of England and his son Charles II during the English Civil War, the Interregnum, and the Restoration. It was later adopted by the Royalists themselves. Although it referred originally to political and social attitudes and behaviour, of which clothing was a very small part, it has subsequently become strongly identified with the fashionable clothing of the court at the time. Prince Rupert, commander of much of Charles I's cavalry, is often considered to be an archetypal Cavalier.

Roundheads were the supporters of the Parliament of England during the English Civil War (1642–1651). Also known as Parliamentarians, they fought against King Charles I of England and his supporters, known as the Cavaliers or Royalists, who claimed rule by absolute monarchy and the principle of the divine right of kings. The goal of the Roundheads was to give to Parliament the supreme control over executive administration of England.