First English Civil War: Roundhead forces under Sir William Waller led a successful surprise attack in Hampshire on a winter garrison of Cavalier infantry and cavalry.

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.

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.

Sir William Waller JP was an English soldier and politician, who commanded Parliamentarian armies during the First English Civil War. Elected MP for Andover to the Long Parliament in 1640, Waller relinquished his military positions under the Self-denying Ordinance in 1645. Although deeply religious and a devout Puritan, he belonged to the moderate Presbyterian faction, who opposed the involvement of the New Model Army in politics post 1646. As a result, he was one of the Eleven Members excluded by the army in July 1647, then again by Pride's Purge in December 1648 for refusing to support the Trial of Charles I, and his subsequent execution in January 1649.

The Battle of Alton, of the First English Civil War, took place on 13 December 1643 in the town of Alton, Hampshire, England. There, Parliamentary forces serving under Sir William Waller led a successful surprise attack on a winter garrison of Royalist infantry and cavalry serving under the Earl of Crawford. The Battle of Alton was the first decisive defeat of Sir Ralph Hopton, leader of Royalist forces in the south, and the event had a significant psychological effect on him as commander. More important to Hopton was the loss of men, however, as he was already short-handed in much-needed infantry. The successful Parliamentarians were able, after their victory, to attack and successfully besiege Arundel, a larger and more formidable Royalist outpost to the south-east of Alton.