By 1792 the constitutional monarchy that most of 1789's revolutionaries had wanted was already failing.
Louis had tried to flee France in June 1791, disguised as a servant, hoping to reach loyal troops near the border and return with an army. He was recognised at a town called Varennes and brought back to Paris under guard. The flight destroyed what remained of public trust in him. A king who tried to escape his own country looked, to many, like a king already at war with his people.
France declared war on Austria in April 1792, partly to export revolutionary principles and partly because radical factions believed a war would expose the king's foreign sympathies. It went badly at first. Foreign armies advanced toward Paris. A Prussian commander issued a manifesto threatening the city with destruction if the royal family were harmed, a threat that convinced many Parisians the king was in league with the invaders.
In August 1792 a crowd stormed the royal palace itself. The monarchy was suspended. In September, amid panic that royalist prisoners in the city jails would rise up behind the lines while the army fought at the front, crowds broke into the prisons and killed over a thousand inmates in a few days, with only cursory pretence of trial. The Republic was declared weeks later. In January 1793 the king was tried, convicted of conspiracy against the state, and guillotined.
By the spring of 1793 France was at war with Austria, Prussia, Britain, Spain and the Dutch Republic simultaneously, a coalition alarmed by the king's execution and by fears the revolution would spread.
At the same time, a rebellion broke out in the western region of the Vendée, driven by resentment at conscription, at the persecution of priests who refused to swear loyalty to the new constitutional church, and at the abolition of the old order more broadly. It became a full civil war, fought with extraordinary brutality on both sides, and casualty estimates for the region run into the hundreds of thousands.
The Convention, the revolutionary assembly now governing France, faced war on every frontier and rebellion in its own territory. It responded by creating emergency institutions with sweeping power: a Committee of Public Safety to direct the war effort and root out internal enemies, and revolutionary tribunals empowered to try and execute people accused of counter-revolutionary activity, with limited rights of defence.
The Terror, as the period from roughly September 1793 to July 1794 is known, operated on a specific and dangerous logic. In wartime, with enemies on every border and traitors suspected everywhere, the safety of the republic was declared the highest law.
A Law of Suspects passed in September 1793 authorised arrest not merely for actions but for insufficient enthusiasm for the revolution, for having aristocratic relatives, for ambiguous conduct. Proof of guilt was not always required. Suspicion itself became grounds for imprisonment, and often for execution.
The Committee of Public Safety, led in practice by Maximilien Robespierre and a small circle of allies, argued that virtue without terror is powerless, and that terror in the service of virtue is not a vice but an emergency necessity. This was not cynicism, or not only cynicism. Robespierre and his allies appear to have genuinely believed they were purifying the republic of corruption in order to build a just society, and that belief made the killing easier rather than harder, since each execution could be understood as a step toward virtue rather than a crime against it.
It is worth adding a number to that word terror. Roughly seventeen thousand people were executed by formal sentence of the revolutionary tribunals across France during this period, a figure that comes from surviving court records rather than estimate. Paris accounted for a sizeable share, but the worst single episodes happened in the provinces, where representatives sent from the capital to crush the Vendée rebellion and other regional revolts sometimes ordered mass drownings and mass shootings that bypassed the tribunals altogether.
Estimates of the total dead during the Terror run to somewhere around forty thousand, including those executed by guillotine, those shot in mass executions in provincial cities suppressing rebellion, and those who died in prison awaiting trial. The guillotine itself, designed originally as a humane reform, a quick and equal death regardless of social rank, replacing the drawn-out and unequal punishments of the old regime, became the Terror's central symbol, and the word terror was, remarkably, used approvingly by its own architects rather than only by its later critics.
The most striking feature of the Terror, and the one every subsequent revolution has had to reckon with, is that it did not stop with royalists and foreign agents. It turned on the revolutionaries themselves.
Georges Danton, one of the most prominent leaders of the early republic, was arrested, tried before a tribunal that gave him almost no chance to speak in his defence, and guillotined in April 1794, on charges of corruption and insufficient revolutionary zeal that his former colleagues on the Committee had themselves engineered.
Jacques Hébert and his radical faction, who had pushed for even more aggressive dechristianisation and economic control than Robespierre favoured, were executed weeks earlier for the opposite reason: excessive extremism that Robespierre judged dangerous to the republic's stability.
This pattern, in which each successive wave of revolutionary leadership accused and executed the previous wave, is what later political theorists mean when they describe a revolution devouring its own children. Nobody was safe, including the men directing the killing. Robespierre himself was arrested by his own colleagues in July 1794, in a coup organised partly out of genuine alarm at his growing power and partly out of simple fear that he would turn on them next. He was guillotined the following day without a real trial, in exactly the summary manner the Terror had made routine.
The Terror was not only political. It attempted, for a time, to remake culture itself.
In October 1793 the Convention adopted a new calendar. Years were counted from the founding of the Republic. Months were renamed for the weather and the harvest. The seven-day week was replaced by a ten-day one, removing Sunday and, with it, the rhythm of Christian worship.
Dechristianisation went further still in some regions. Churches were closed or converted into Temples of Reason. Priests were pressured to marry or to renounce their vocation. In Paris, a Festival of Reason was staged inside the cathedral of Notre-Dame itself, with an actress dressed as the Goddess of Reason enthroned where the altar had stood.
Robespierre, despite leading the Terror, actually opposed this campaign. He worried it alienated ordinary believers and handed a propaganda weapon to the revolution's enemies. In its place he promoted a new state religion of his own design, the Cult of the Supreme Being, built around a vague deism meant to preserve morality without restoring the old church's authority. He staged an enormous festival for it in June 1794, at which he himself presided in a sky-blue coat, weeks before his own execution.
None of it took root. The calendar was abandoned within a decade. The Cult of the Supreme Being died with its founder. What survived was narrower and more durable: a formal separation of church and state that, revised and softened many times, remains a defining feature of French public life to this day.
Not everyone who criticised the Terror was a royalist, and one case makes that plain.
Olympe de Gouges, the playwright who in 1791 had written the Declaration of the Rights of Woman answering the gap in the Declaration of the Rights of Man, supported the revolution's early goals but opposed the execution of the king and, later, opposed Robespierre's growing dictatorship directly and in print. She argued that a revolution made in the name of liberty could not justify itself through arbitrary killing.
She was arrested in 1793 and tried before a revolutionary tribunal. The charge was not treason in any conventional sense. It was, in substance, that she had criticised the Convention's authority and questioned whether France should remain a single, indivisible republic rather than a federation. She was guillotined that November, one of the relatively small number of women executed by name during the Terror, and one of the few killed explicitly for writing rather than for conspiracy.
Her case is worth holding onto because it complicates any simple story of the Terror killing only the guilty, or only the revolution's enemies. She was neither. She was a revolutionary who thought the revolution had betrayed itself, and she said so publicly, and that alone was enough.
Robespierre's fall, known as the Thermidorian Reaction after the revolutionary calendar month in which it occurred, ended the Terror almost immediately. The revolutionary tribunals were reined in. The Law of Suspects was repealed. Prisoners were released in large numbers.
It did not restore the monarchy, and it did not undo the revolution's core achievements: the abolition of feudal privilege, the principle of legal equality, the new administrative and legal structures. It did discredit, for a generation and arguably much longer, the specific idea that virtue could be enforced through organised state killing.
The government that followed, a five-man executive called the Directory, was weak, corrupt and unstable, unable to satisfy either royalists who wanted the old order back or radicals who felt the revolution had been betrayed. It survived five years through repeated coups and rigged elections, and it created exactly the conditions of institutional exhaustion that let a young and popular general seize power in 1799, which is where the next chapter begins.
Firm: the sequence of events, the tribunal records, and the numbers executed by formal sentence, which survive in detailed court records and have been carefully counted by historians.
Soft: the total dead including the provincial suppressions and prison deaths, where record-keeping was far less careful and where estimates depend on regional studies of uneven quality.
Contested: whether the Terror was a betrayal of the revolution's founding ideals or their logical, even inevitable, extension under the pressure of foreign war and civil war. One long tradition treats it as an aberration, a departure from 1789's principles caused by circumstance and by the particular psychology of Robespierre and his circle. Another argues that the seeds of the Terror, the idea of a general will that could override individual dissent, examined in chapter thirty three's discussion of Rousseau, were present in the revolution's own founding theory from the start, and that war and crisis simply activated what was already there.
A caution about hindsight. It is easy, from two centuries' distance, to see the Terror as the revolution's obvious destination. Nobody living through 1789 thought so. The men who wrote the Declaration of the Rights of Man did not intend the guillotine, and most of them did not survive to see how their own revolution would judge them.