1D - The First and Second Civil Wars: England, Scotland, Ireland and the reasons for royalist defeat
The wars of the 1640s linked disputes in three kingdoms, and the alliances changed as the fighting continued. This lesson explains why Charles I could win important victories yet lose both wars, and why Parliament's military success created new political problems.
Coalitions and resources
Civil war began in England in 1642 without a settled division between a democratic Parliament and an absolutist king. Many royalists believed that hereditary monarchy protected law, property and the established Church. Many parliamentarians wanted to restrain Charles and defend Protestant religion while retaining a king. Both camps included landowners, merchants and ordinary people. Local loyalties, religion, family connections and pressure from powerful neighbours helped determine allegiance.
Parliament held London, much of the south-east and East Anglia, and most of the navy. London's population, commercial wealth and credit supplied money and men. Naval control protected trade and made overseas supplies to the king more difficult. Charles established his headquarters at Oxford and drew strength from Wales, the west and much of the north. These were broad patterns: neither side controlled every community within its main regions.
Resources mattered only when they could be organised. Parliament developed an assessment, a regular tax on property, and an excise, a tax on goods, while confiscating opponents' property and borrowing. County committees collected money and recruited soldiers. Royalists also taxed, borrowed and requisitioned supplies, but fragmented regional commands and a narrower economic base made sustained coordination harder. Both armies imposed burdens on civilians, including billeting and free quarter, taking accommodation and supplies without immediate payment.
The key causal relationship is between resources, administration and military staying power. A wealthy region did not automatically produce victory; its wealth had to pay, equip and supply a force capable of continuing a campaign. Parliament gradually built that connection more effectively.
War coalition
A temporary alliance of groups fighting a shared opponent despite differences about the settlement they want afterwards.
The First Civil War in England
The First Civil War lasted from 1642 to 1646, and royalist defeat was not inevitable at its outset. The inconclusive Battle of Edgehill in October 1642 failed to destroy Parliament's army. In November, the defence of Turnham Green blocked the royalist advance towards London. This mattered beyond the battlefield: Charles lost an opportunity to take Parliament's political centre before its financial and military organisation matured.
Royalists made major gains in 1643, including Prince Rupert's capture of Bristol. They could nevertheless struggle to turn victories in separate regions into a coordinated advance on London. Commanders had local priorities, communications were slow, and armies needed to protect their own supply areas. Parliament also suffered serious setbacks: the surrender of much of Essex's infantry at Lostwithiel in 1644 shows that later victory should not be read backwards as continuous superiority.
Two battles altered the balance. At Marston Moor, near York, on 2 July 1644, Scottish Covenanters and English parliamentary armies defeated the royalists. York fell soon afterwards, and royalist power in the north was sharply weakened. At Naseby on 14 June 1645, Thomas Fairfax's New Model Army defeated Charles's principal field army. Parliamentary infantry survived heavy pressure, while disciplined cavalry could return to the main battle after defeating opponents. The destruction and capture of royalist soldiers, weapons and supplies reduced Charles's capacity to rebuild.
Naseby did not instantly end fighting. The New Model won at Langport in July 1645 and reduced remaining western strongholds. Charles surrendered to the Scots in May 1646; Oxford surrendered in June. Sieges and the loss of supply centres completed what field battles had begun.
Scotland and Ireland in the war
Scotland and Ireland changed the balance in England, but their forces were pursuing their own aims. Scottish Covenanters defended a Presbyterian church, governed through assemblies and elders rather than bishops. In 1643 Parliament accepted the Solemn League and Covenant, promising religious reform, in return for Scottish military help. A Scottish army entered England in 1644 and contributed to victory at Marston Moor. English parliamentary allies did not all agree that the covenant required a uniform Scottish-style church: this difference would become a source of post-war conflict.
Charles also tried to mobilise support beyond England. In Scotland, James Graham, Marquis of Montrose, led a royalist campaign with support including Highland forces and Irish soldiers under Alasdair MacColla. Victories in 1644–45 disrupted Covenanting control. Yet Montrose's army was not a stable force available for a joint invasion of England: some supporters had local or clan objectives, and his defeat at Philiphaugh in September 1645 ended his main campaign.
Ireland had already been at war following the rebellion of 1641. The Catholic Confederation, organised at Kilkenny in 1642, sought security for Catholic worship, land and political interests. It was not simply a branch of English royalism. Confederate leaders disagreed over concessions to Protestant royal government; royalist forces, Scottish forces in Ulster and parliamentary forces also operated in Ireland.
In 1643 the royalist commander Ormond agreed a cessation of fighting with the Confederates. This allowed some royal troops serving in Ireland to move to England. Charles hoped to gain reinforcements, but association with Irish Catholic support damaged his credibility among English Protestants.
Irish fighting and divisions continued after the king's main English army had been defeated. Owen Roe O'Neill defeated Scottish-led forces at Benburb in June 1646, but Confederate military success did not produce a united settlement. The papal representative Rinuccini and clerical allies rejected Ormond's peace because its religious concessions were insufficient. In 1647 Ormond handed Dublin to Parliament, while parliamentary victories weakened other Confederate armies. Renewed negotiations in 1648 still met divisions over religious and political terms. Ireland's war therefore followed its own course: victory in England did not automatically determine its outcome, and Charles could not treat Catholic manpower as an obedient reserve.
Across the three kingdoms, alliance-building brought military help while increasing religious suspicion and conflicting obligations. Scottish and Irish forces were participants with aims of their own, not merely resources waiting for English leaders to deploy.
The New Model Army
Parliament's reorganisation of its armed forces in 1645 converted advantages into a more effective national army. Earlier armies were associated with regions or particular commanders. Their soldiers could resist campaigning far from home, and rival generals disagreed about whether to defeat Charles decisively or preserve room for compromise.
The New Model Army, commanded by Sir Thomas Fairfax, combined forces into an army directed towards national objectives. More consistent organisation, discipline and financial support improved its ability to keep campaigning. Pay still fell into arrears, so it should not be imagined as a perfectly supplied modern force. Its effectiveness lay in greater cohesion relative to its opponents, rather than the absence of shortages.
The Self-Denying Ordinance of April 1645 required MPs and peers to relinquish military commands, weakening the position of older commanders such as Essex and Manchester. Cromwell remained in military service through continued exceptions and became lieutenant-general of the cavalry. Fairfax's overall leadership and the work of experienced officers and soldiers are essential to explaining victory; Cromwell did not win the war alone.
Religious commitment could strengthen morale. Many soldiers believed they were serving a godly cause, and successful campaigning reinforced that conviction. Religious variety within the army also made a compulsory Presbyterian settlement unattractive to many of them. Military effectiveness therefore had a political consequence: the organisation that defeated the king acquired confidence, a collective identity and the power to obstruct settlements it considered unsafe.
The New Model's victories depended on national organisation, resources, discipline and leadership working together. Its success also made the army a political force in its own right.
The Second Civil War and royalist defeat
Military defeat in 1646 did not remove Charles's ability to negotiate, encourage supporters or exploit disputes among his enemies. Under the Engagement of December 1647, he agreed with a faction of Scottish Covenanters to accept Presbyterianism in England for three years in return for support. The Scottish Engagers, led by the Duke of Hamilton, wanted to restore a limited monarchy and prevent English army radicalism from determining Britain's future. Other Covenanters opposed the deal, so Scotland was divided.
The Second Civil War in 1648 combined uprisings in England and Wales with a Scottish invasion. Risings in South Wales, Kent and Essex were poorly coordinated. Fairfax suppressed resistance in Kent and besieged Colchester; Cromwell overcame resistance in Wales before confronting Hamilton's invading army. At Preston, in August 1648, parliamentary forces defeated the dispersed and badly coordinated Scottish-led army. Colchester surrendered later that month. The New Model's ability to concentrate against threats in turn was more effective than its opponents' attempt to produce a simultaneous challenge.
The reasons for royalist defeat can be weighted rather than merely listed. Parliament's economic and naval advantages were long-term conditions; improved administration and the New Model made them usable. Allied Scottish assistance was especially important in 1644. Royalist failures of coordination, weakening recruitment and supply, and Charles's problematic Catholic connections constrained alternatives. Individual decisions and battlefield leadership determined how these advantages were realised.
These factors interacted: a destroyed royalist army was harder to replace because the king's tax base and supply routes were shrinking. In 1648, war weariness and mistrust limited support for renewed fighting. The defeat of Charles's new coalition also persuaded influential army officers that another negotiated restoration might lead to yet another war. Defeat opened the road to regicide without making that outcome the inevitable purpose of the war begun in 1642.