The Invasion That Wasn't: England’s Bloodless Coup and Its Violent Edges

The Glorious Revolution is often portrayed as a remarkably peaceful transition of power—a “bloodless” coup that chased James II from the throne and ushered in constitutional monarchy. Yet that clean narrative ignores the brutal reality: from the moment William of Orange’s fleet set sail, the British Isles erupted into a cascade of sieges, skirmishes, and pitched battles that would determine not only who wore the crown but the religious and political character of three kingdoms. Far from an orderly swapping of monarchs, the revolution was a military campaign fought on multiple fronts, with outcomes shaped by the resilience of walled cities, the loyalty of local militias, and the bloody arithmetic of field engagements. To understand how William and Mary ultimately prevailed, it is essential to look beyond Westminster and examine the key battles that defined the Glorious Revolution.

The Strategic Landscape Before the Invasion

By the autumn of 1688, James II had alienated much of the English political nation. His open Catholicism, his efforts to pack Parliament and the judiciary with co-religionists, and the birth of a Catholic heir in June sparked an invitation from seven Whig and Tory peers—the “Immortal Seven”—for William of Orange to intervene. William, a seasoned military commander and husband of James’s Protestant daughter Mary, had been preparing for such a moment for years. His motivation was as much geopolitical as religious: he needed England’s resources to counter Louis XIV’s France in the Nine Years’ War. When the Dutch armada of over 450 ships, carrying some 15,000 soldiers and a further 21,000 sailors, landed at Brixham in Devon on 5 November 1688, it was the largest amphibious operation Europe had seen since the Spanish Armada. James II, despite commanding an army of around 30,000 regulars, found his support dissolving. Yet the revolution would not be won by defections alone; armed clashes, many of them overlooked, proved decisive in shattering Jacobite resistance.

The First Shots: Wincanton Skirmish (20 November 1688)

Though often forgotten, the Wincanton Skirmish was where the Glorious Revolution drew first blood. As William’s forces advanced inland, a small patrol of Irish dragoons loyal to James, commanded by Colonel Richard Hamilton, encountered a detachment of William’s scouts near the Somerset town of Wincanton. In the confused fighting that followed, Lieutenant Thomas Campbell of William’s army became the first fatality of the campaign. The skirmish was militarily insignificant—barely a few dozen men on each side—but it sent a shock through both camps. James’s supporters pointed to the bloodshed as proof of Dutch aggression, while William’s officers understood that even a “bloodless” invasion would have its casualties. More importantly, the skirmish showed that James’s Irish troops were prepared to fight, a preview of the stubborn resistance William would face across the Irish Sea.

The Battle of Reading: A Kingdom Shifts Allegiance (9 December 1688)

The Battle of Reading was the only significant field action on English soil during the invasion, and it was less a battle than a decisive show of force. James had ordered a forward detachment of around 600 Irish soldiers under Colonel Sir John Lanier to secure the town of Reading and block the road to London. On 9 December, William’s vanguard, a mixed force of Dutch, English, and Huguenot troops, approached from the west. A brief but sharp firefight broke out in the streets and around the marketplace. The Irish troops, outnumbered and outmanoeuvred, quickly withdrew. The skirmish was small—fewer than twenty casualties on both sides—yet its impact was seismic. News of the “victory” spread rapidly, convincing wavering gentry and military commanders that William’s advance was irresistible. Within days, James’s commander-in-chief, John Churchill (the future Duke of Marlborough), defected. The road to London lay open. Reading demonstrated that the military balance in England had tilted decisively, not through mass slaughter, but through the collapse of morale and the calculated self-preservation of James’s officers.

The Siege of Londonderry: The 105-Day Ordeal (18 April – 28 July 1689)

If the battles in England were decided by posturing and pragmatism, the Irish campaign was defined by visceral sectarian conflict. Nowhere was this more evident than at Londonderry. After James II landed in Ireland in March 1689, hoping to use the island as a base for reclaiming his throne, the walled city of Londonderry became the focal point of Jacobite ambition. The city’s predominantly Protestant population had already closed the gates to James’s Catholic troops in December 1688—the famous action of the thirteen apprentice boys—but the full siege began in April 1689 when Jacobite forces under the Earl of Tyrconnel and the French general Conrad de Rosen surrounded the city.

For 105 days, around 30,000 soldiers and irregulars besieged some 7,000 defenders and a swollen civilian population of perhaps 30,000. Conditions inside the walls were horrific. Starvation and disease killed as many as shot and shell. The defenders, led by the joint governors Colonel Robert Lundy (who later fled and was branded a traitor) and Major Henry Baker, held out with a mixture of desperate courage and religious zeal, their watchword “No Surrender” crystallising into Protestant iconography. Relief finally came on 28 July when a short, violent action saw the armed merchant ship Mountjoy break through a defensive boom across the River Foyle under heavy fire. The Jacobite army broke camp three days later. Londonderry did not end the war in Ireland—that would require two more years of bloodshed—but it transformed the conflict. The siege became a rallying symbol for Irish Protestants and guaranteed that William would commit fully to the Irish theatre.

While land engagements dominate the history books, the Glorious Revolution was also secured at sea. James II’s alliance with Louis XIV gave him access to the French fleet, and the Battle of Bantry Bay was the first major naval clash of the war. On 11 May 1689, an English fleet under Admiral Arthur Herbert engaged a larger French squadron off the coast of County Cork. The French were escorting supplies and reinforcements for James, and Herbert’s mission was to interrupt that lifeline. The battle itself was indecisive—both sides suffered moderate damage, and the French succeeded in landing their convoy—but it established a pattern. From that point forward, the Royal Navy, increasingly remodelled along Dutch lines under William’s influence, maintained a loose blockade that prevented a large-scale French invasion of England. Naval engagements would continue throughout the subsequent Nine Years’ War, but Bantry Bay signalled that control of the Channel and the Atlantic would not be ceded, isolating Jacobite forces in Ireland from the kind of foreign support that might have turned the revolution back.

Highland Steel: The Battle of Killiecrankie (27 July 1689)

The revolution in Scotland was far from bloodless. The first Jacobite rising, led by James Graham, Viscount Dundee (known as Bonnie Dundee), sought to rally the Highland clans to James’s cause. The culminating clash came at the Battle of Killiecrankie in Perthshire. On 27 July 1689, a government army of around 3,500 men, mostly Lowland regulars and some Dutch troops under Major-General Hugh Mackay, faced Dundee’s 2,400 Highlanders. Mackay’s forces were positioned on a ridge above the River Garry, but Dundee’s men exploited the dead ground and unleashed the famed Highland charge.

The charge was devastating. The government ranks broke and fled, suffering over 2,000 casualties. Yet the Jacobite victory was hollow. Dundee received a mortal wound, shot through the chest as he raised his arm in command, and died on the field. Without his leadership, the rising foundered. The Highland clans slipped back to their glens, and the Battle of Dunkeld a few weeks later saw the Jacobites repulsed by a stubborn defence from the Cameronian regiment. Killiecrankie remains a reminder that the Glorious Revolution was not universally welcomed. In the Highlands, it was imposed at the point of a bayonet, and the sacrifices made there sowed long-lasting resentments that would erupt again in 1715 and 1745.

The Boyne: The Battle That Made a King (1 July 1690)

No engagement of the Glorious Revolution looms larger—politically or culturally—than the Battle of the Boyne. By the summer of 1690, William himself had landed in Ireland with a multinational army of over 36,000 men, including Dutch Blue Guards, English regiments, Danish mercenaries, and French Huguenots. James’s army, roughly 25,000 strong, held the south bank of the River Boyne near Oldbridge, a position reasonably strong but with a crucial weakness: its left flank was uncovered. On 1 July (12 July under the modern calendar), William launched a concerted assault. While a portion of his army demonstrated in front, a flanking force crossed the river upstream at Rosnaree, drawing away French and Irish reserves. Then the main Dutch and Guards battalions forced a passage at Oldbridge.

The fighting was intense and bloody, especially around the marshy ground near the river. William himself rode among his troops, a conspicuous figure in his dark cloak and broad hat, rallying his men even after a Jacobite cannonball grazed his shoulder. James, by contrast, retired early from the field and rode towards Dublin. The Jacobite army, though battered, retreated in reasonable order, but James fled to France never to return. The Boyne was not a devastating tactical defeat—casualties were between 1,500 and 2,000 killed and wounded on both sides—but it was a strategic catastrophe for the Jacobite cause. It secured Dublin for William and convinced the Catholic powers of Europe that James’s restoration was a lost hope. In Irish Protestant memory, the Boyne became the defining moment of deliverance, while for Irish Catholics it marked the beginning of a long, punitive settlement.

The Final Sieges: Limerick and the Treaty Stone (1690–1691)

Even after the Boyne, Jacobite resistance did not collapse immediately. The city of Limerick, a formidable fortress straddling the Shannon, became the last redoubt. William’s first attempt to take the city in August 1690 was repulsed in a bloody repulse at the breach after a tenacious defence by an Irish garrison under the French general Marquis de St. Ruth. The following year, William’s Dutch general, Godert de Ginkel, renewed the campaign. The culminating Battle of Aughrim on 12 July 1691—more costly than the Boyne, with perhaps 7,000 Jacobite dead—shattered the remaining Irish army. Limerick itself fell after a second siege, and the Treaty of Limerick was signed on 3 October 1691 on a stone slab still known as the Treaty Stone. The terms promised Catholic rights but were soon dishonoured, entrenching the penal laws and the Protestant Ascendancy. The military campaigns in Ireland thus closed with a negotiated surrender, but the political wound would fester for centuries.

Skirmishes and the Unseen War: Local Fighting Across the Three Kingdoms

Focusing only on the major set-pieces obscures the hundreds of small engagements that ground away Jacobite resistance. Across England, raiding parties loyal to James harried Williamite supply columns. In Cheshire, a Jacobite rising led by Viscount Molyneux briefly captured Chester before melting away. In the West Country, local militias exchanged fire with advancing Dutch patrols. Scotland saw a diffuse guerrilla war, with clan warfare blurring into political allegiance. These minor clashes rarely changed the strategic picture on their own, but collectively they stretched William’s resources and kept the kingdoms unsettled. More importantly, they forced communities to declare their loyalties publicly, accelerating the political realignment that underpinned the new regime. In many towns, the arrival of a small troop of Williamite dragoons was enough to decide the allegiance of the local gentry without a shot being fired.

Impact of the Military Campaigns

The battles of the Glorious Revolution were not mere footnotes to a parliamentary drama. They were the engine that drove regime change. The skirmish at Wincanton signalled the end of bloodless transition; Reading proved the brittleness of James’s English support; Londonderry demonstrated that Protestant Irish resolve could not be starved out; Killiecrankie showed that even defeats could be lethal to a rebellion; and the Boyne delivered the symbol and the strategic victory William needed. Collectively, these engagements created the facts on the ground that diplomacy and propaganda later ratified. They also entrenched a pattern of military reliance on foreign troops—Dutch, Danish, Huguenot—that would colour British politics for a generation. The constitutional settlement of 1689, with its Bill of Rights and new coronation oaths, was born not only of reasoned debate but of hard campaigning. For the ordinary soldier, Protestant or Catholic, the Glorious Revolution was anything but bloodless. It was a war fought for the soul of three kingdoms, won in riverside clashes, city walls, and Highland passes, and its legacy is still written on the memorials of Londonderry and the murals of Belfast.

To fully grasp the revolution’s meaning, one must walk the ramparts of Derry’s walls, stand on the ridge above Killiecrankie, or trace the gently sloping banks of the Boyne. These places are the true classrooms of 1688—awkward, violent, and impossible to reduce to parliamentary minutes. The battles did not just define the Glorious Revolution; they ensured that the revolution’s questions of sovereignty, faith, and nationhood would echo through centuries of British and Irish history.