Cromwell and the Interregnum Period

The decade between the execution of Charles I in 1649 and the restoration of his son in 1660 represents one of the most turbulent and ideologically fraught periods in British history. Known as the Interregnum, or "between reigns," this era saw England governed without a monarch, first as a republic and then under the rule of Oliver Cromwell. Understanding this period is crucial for grappling with the enduring tensions between military authority, republican idealism, religious fervor, and the persistent desire for political stability.

From Regicide to Republic: Establishing the Commonwealth

The execution of Charles I in January 1649 was a revolutionary act that left a power vacuum. The Rump Parliament, purged of its more conservative members, abolished the monarchy and the House of Lords, declaring England a Commonwealth, or republic. Oliver Cromwell, already the leading figure in the New Model Army, became the Commonwealth's most powerful man. His immediate challenge was to secure the new regime against external and internal threats. This meant confronting Royalist uprisings and, more significantly, subduing Ireland and Scotland, which had proclaimed Charles II as king.

Cromwell's military campaigns were brutal and defining. In Ireland (1649–50), his actions, particularly the sieges of Drogheda and Wexford, are remembered for their severity. Cromwell justified the slaughter as a righteous judgment against "barbarous wretches" who had massacred Protestant settlers in the 1641 rebellion, and as a necessary tactic to prevent prolonged warfare. The campaign effectively broke organized Royalist resistance in Ireland but cemented a legacy of bitterness. In Scotland (1650–51), Cromwell defeated a Scottish army at Dunbar and, a year later, destroyed Charles II's forces at Worcester. This "crowning mercy" ended the Third English Civil War and left the Commonwealth militarily secure, but it also reinforced the army's role as the ultimate guarantor of the state.

The Protectorate: Cromwell’s Constitutional Experiment

By 1653, Cromwell had grown deeply frustrated with the Rump Parliament, which he viewed as self-serving and ineffective. He famously dismissed it, declaring, "You have sat too long for any good you have been doing." After a brief and unsuccessful experiment with a nominated assembly known as the Barebone's Parliament, a new constitution, the Instrument of Government, was drafted. This document made Cromwell Lord Protector for life, establishing the Protectorate.

The Protectorate was a curious hybrid. It retained a Parliament (elected on a reformed, though still limited, franchise) and a Council of State, but ultimate executive authority lay with the Protector. Cromwell's relationship with his Parliaments was as troubled as with previous ones. He sought "healing and settling"—a broad national consensus—but MPs repeatedly challenged the Instrument of Government, the size of the army, and the extent of religious liberty. Cromwell's dissolution of his first Parliament in 1655 led to a period of direct military rule, where England was divided into districts governed by Major-Generals. This deeply unpopular system, intended to promote godly reformation and improve security, highlighted the regime's reliance on force and its failure to achieve lasting civilian consent.

Religious Toleration and Puritan Society

Cromwell’s personal faith was the core of his politics. A committed Puritan and Independent, he genuinely believed in a degree of religious toleration far broader than anything previously known in England. Under the Protectorate, the established church was maintained, but worship outside it—for most Protestant sects like Baptists and Congregationalists—was permitted. Jews were allowed to return to England. This policy stemmed from Cromwell’s belief in "liberty of conscience," the idea that the state should not compel matters of faith.

However, this toleration had strict limits. It did not extend to Roman Catholics, whose faith was associated with political subversion, or to Anglicans using the Book of Common Prayer, which was seen as a symbol of the old, rejected order. Furthermore, the aggressive moral reform pushed by the Major-Generals, which sought to close taverns and ban festive activities, created widespread resentment. For many, Cromwell's godly commonwealth felt like an intrusive, joyless dictatorship.

Revolutionary Democrat or Military Dictator?

Historians have long debated Cromwell’s essential nature. Was he a revolutionary democrat or a military dictator? Evidence exists for both interpretations.

The case for the revolutionary democrat points to his genuine advocacy for religious liberty, his search for a constitutional settlement through written documents, and his rhetorical commitment to the "good of the people." He rejected the crown when offered it in 1657 under the revised Humble Petition and Advice, suggesting an unease with outright kingship. He believed he was providentially guided to establish a godly nation.

The case for the military dictator is equally strong. His power was rooted in the army’s loyalty. He dissolved elected parliaments by force, instituted the rule of the Major-Generals, and crushed opposition in Ireland and Scotland with ruthless force. The Protectorate, despite its parliaments, functioned as a thinly veiled military regime where ultimate authority flowed from the sword. Cromwell saw himself as a paternalistic ruler, tasked with guiding the nation toward righteousness, even against its will.

In reality, Cromwell was a complex figure trapped by the contradictions of the revolution he helped lead. He sought stability and reform but could only maintain power through the very military force that undermined his government's legitimacy.

The Drift to Restoration: 1658–1660

The Protectorate was inherently unstable, overly dependent on Cromwell’s personal authority. His death in September 1658 was a catastrophe for the regime. He was succeeded by his son, Richard Cromwell, who lacked the military prestige and political skill of his father. Richard’s brief rule exposed the fundamental weakness of the Protectorate: without the unifying figure of Oliver, the army and Parliament fell into irreconcilable conflict.

The army, fearing for its pay and influence, forced Richard to dissolve Parliament. In the ensuing political chaos, General George Monck, commander of forces in Scotland, marched south. Monck facilitated the recall of the Long Parliament, which then voted for its own dissolution and called for fresh elections. The newly elected Convention Parliament, with a strong Royalist presence, invited Charles II to return, issuing the Declaration of Breda in which Charles promised pardon, religious toleration, and payment of army arrears. The Restoration in May 1660 was not a triumphant counter-revolution but a weary national consensus for a return to known constitutional forms after a decade of experiment and instability.

Common Pitfalls

• Viewing Cromwell’s actions in Ireland through a purely modern lens. While his campaign was exceptionally brutal, it is a historical simplification to label it an act of "genocide" in the 20th-century sense. Contemporary justifications were rooted in revenge theology, military pragmatism, and a sectarian view of Catholicism as politically seditious. Understanding requires contextualizing 17th-century rules of war and religious conflict.
• Assuming the Interregnum was a monolithic "Puritan" period. The period saw incredible religious and political diversity, from Diggers and Levellers to conservative Presbyterians. Cromwell’s government was constantly negotiating between these factions. The popular image of a universally dour, fun-hating society is an exaggeration, though moral reform was a key aim of the regime’s most zealous supporters.
• Overstating the democratic nature of Cromwell’s regimes. While the Instrument of Government expanded the franchise, it also contained many conservative features and was ultimately subservient to the Protector’s and the army’s authority. The repeated dissolutions of Parliament demonstrate that popular representation was secondary to Cromwell’s vision of godly rule and national stability.

Summary

• The Interregnum (1649–1660) began with the republican Commonwealth and evolved into Cromwell’s Protectorate, a constitutional experiment that vested supreme authority in a Lord Protector.
• Cromwell’s military campaigns in Ireland and Scotland were decisive in crushing Royalist resistance but were marked by severe brutality, leaving enduring political and sectarian legacies.
• Cromwell’s policy of religious toleration was radical for its time, extending to most Protestant nonconformists, but explicitly excluded Catholics and Anglicans, remaining within strict Puritan boundaries.
• Cromwell’s relationship with successive Parliaments was consistently fraught, revealing the fundamental tension between his desire for settled government and his reliance on military power to override political opposition.
• The Restoration of Charles II in 1660 was caused by the failure to institutionalize the revolution after Cromwell’s death, the political weakness of his son Richard, and a broad national exhaustion that prioritized stability over continued republican experiment.