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Hundred Thousand Sons of Saint Louis
Part of theRoyalist War
Attack and capture of the entrenchments in front of La Coruña by Bourke's division, 15 July 1823 Hippolyte Lecomte, 1828
Date 18 April – 23 November 1823 Location Spain Result Franco-Spanish victory End of theTrienio Liberal Start of theOminous Decade
Belligerents
France Armée de la Foi	Partisans of theCortes
Commanders and leaders
Duke of Angoulême Armand Guilleminot Nicolas Charles Oudinot Gabriel Molitor Bon-Adrien Jeannot de Moncey Étienne Bordesoulle Louis de Hohenlohe	Rafael del Riego  Pablo Morillo Francisco Ballesteros Francisco Espoz Miguel de Álava Count of La Bisbal
Casualties and losses
France: 400 killed[1]	600 killed[1]

The "Hundred Thousand Sons of Saint Louis" was the popular name for a French army mobilized in 1823 by theBourbonKing of France,Louis XVIII, to help the Spanish Bourbon royalists restore KingFerdinand VII of Spain to theabsolute power of which he had been deprived during theLiberal Triennium. Despite the name, the actual number of troops was between 60,000 and 90,000.^[2]

A minor campaign, the force comprised some fivearmy corps (the bulk of the French regular army) and was led by theDuke of Angoulême, nephew of Louis XVIII and son of future KingCharles X. The French name of the conflict isl'Expédition d'Espagne ("the Expedition of Spain").

In 1822, Ferdinand VII applied the terms of theCongress of Vienna, lobbied for the assistance of the other absolute monarchs of Europe, in the process joining theHoly Alliance formed by Russia, Prussia, Austria and France to restore absolutism. In France, the ultra-royalists pressuredLouis XVIII to intervene. To temper their counter-revolutionary ardor, theDuc de Richelieu deployed troops along thePyrenees Mountains along the France-Spain border, charging them with halting the spread of Spanish liberalism and the "yellow fever" from encroaching into France. In September 1822, this"cordon sanitaire" became an observation corps and then very quickly transformed itself into a military expedition.

TheHoly Alliance (Russia,Austria andPrussia) refused Ferdinand's request for help, but theQuintuple Alliance (Russia,Britain,France,Prussia andAustria) at theCongress of Verona in October 1822 gave France a mandate to intervene and restore the Spanish monarchy. Britain protested loudly but was outvoted. On 22 January 1823, a secret treaty, from which Britain was excluded, was signed at the Congress of Verona, allowing France to intervene in Spain to help restore Ferdinand VII as an absolute monarch. With the agreement from the Holy Alliance, on 28 January 1823 Louis XVIII announced that "a hundred thousand Frenchmen are ready to march, invoking the name ofSaint Louis, to safeguard the throne of Spain for a grandson ofHenry IV of France". At the end of February, France'sChambers voted an extraordinary grant for the expedition.Chateaubriand and the ultra-royalists rejoiced; the royal army was going to prove its bravery and devotion in the face of Spanish liberals, fighting for the glory of the Bourbon monarchy.

The newprime minister,Joseph de Villèle, intended to oppose the war. The operation's cost just for aide was excessive, the army's organisation was defective and the troops' loyalty was uncertain. The superintendent of the military was unable to assure logistic support for the expedition's 95,000 men (as counted at the end of March) concentrated in theBasses-Pyrénées and theLandes with 20,000 horses and 96 artillery pieces. To remedy his doubts, he had to consult the munitions-supplierOuvrard, who quickly concluded that marches in Spain were as favourable to his own interests as to those of the army, even if they would be to the detriment of the public treasury.

The organisation of the expedition's command structure posed many problems. Pro-Bourbon commanders had to be given the full chance to exercise the roles they had so recently been given by theBourbon Restoration without compromising the army's loyalty or efficiency. The solution was to give the secondary commands to royalist formerémigrés andVendéens, and the primary ones to former generals of theRevolution andFirst Empire. Despite his lack of military experience, the Duke of Angoulême, whose father was heir to the throne, was made commander-in-chief of the Army of the Pyrénées, but he agreed to a role overseeing only the political direction of the expedition, leaving its military direction toMajor-GeneralArmand Charles Guilleminot, a tried-and-tested general of the First Empire.

Four of the five army corps were placed under generals who had fought forNapoleon – MarshalNicolas Charles Oudinot, Duke of Reggio; GeneralGabriel Jean Joseph Molitor; MarshalBon Adrien Jeannot de Moncey, Duke of Conegliano; and GeneralÉtienne Tardif de Pommeroux de Bordesoulle. ThePrince of Hohenlohe commanded the Third Corps, the least-trusted of the five, with only two divisions and 16,000 men (as opposed to three or four divisions and 20 to 27 thousand men in the other corps).

The expedition was made up of regiments in which many of the officers, NCOs and men had been marked by memories of theNapoleonic Wars and so were disposed more kindly towards the liberals than were the French and Spanish Bourbons. The liberals hoped to dissuade the Frenchmen from fighting "for monks, against liberty". Villèle was worried at their propaganda in bars and billets, as a song byBéranger spread throughout March and April inciting the French soldiers to mutiny:

On 6 April, the doubts of some and the illusions of others dispersed. On the banks of theBidassoa, 500 liberal French and Piedmontese men faced off against the forward positions of the 9th Light Infantry Regiment. Brandishing aFrench Tricolour flag and singingLa Marseillaise, they incited the soldiers not to cross the frontier. The King's infantrymen hesitated until GeneralLouis Vallin rushed to them and ordered them to open fire. Several of the demonstrators were killed and the others dispersed. Many of them joined Englishmen under ColonelRobert Wilson, Belgians underJan Willem Janssens and other French or Italian volunteers to form a liberal legion and a squadron of "liberty lancers" to fight beside the Spanish constitutional forces. The following day, on 7 April, the "100,000 Sons of Saint Louis" under the Duke of Angoulême entered Spain without opposition from the constitutional government's forces and with the support of the middle classes and part of the urban population.

In the north, Hohenlohe's 3rd Corps (reinforced in July byLauriston's 5th Corps) forcedGeneral Morillo to retreat before rallying his troops. The French were left in control of the rural parts ofNavarre,Asturias andGalicia; however, lacking siege equipment, they were unable to blockade the towns, where the liberals continued to resist for several more months. The city ofA Coruña surrendered on 21 August,Pamplona on 16 September, andSan Sebastián on 27 September. To the east and the southeast, General Molitor pushed back GeneralFrancisco Ballesteros intoAragon, pursuing him as far asMurcia andGranada, winning an engagement atCampillo de Arenas on 28 July and forcing his surrender on 4 August. AtJaén, he defeated the final columns ofRafael Riego, who was captured by the Absolutists on 15 September and hanged inMadrid on 7 November, two days before the fall ofAlicante. InCatalonia, Moncey managed to quellGeneral Mina's regular and guerrilla forces, withBarcelona surrendering only on 2 November.

More decisive operations spread acrossAndalusia, since it was the site ofCádiz, transformed into the Constitutionalists' provisional capital and thus the French force's main strategic objective. It contained theCortes and the imprisoned king and was defended by a garrison of 14,000 men. At first Riego, then GeneralsHenry Joseph O'Donnell, Count of La Bisbal, Quiroga andMiguel de Álava led the action. Access to the city was protected by the batteries ofFort Santa Catalina andFort San Sebastian to the west,Fort Santi-Pietri to the east and above all by the fortified peninsula of Fort de Trocadéro, where Colonel Garcés positioned 1700 men and 50 guns.

Under the command of GeneralÉtienne Tardif de Pommeroux de Bordesoulle, soon joined by the Duke of Angoulême and Guilleminot, the infantry of generals Bourmont, Obert and Goujeon, the cavalry of Foissac-Latour, the artillery ofLouis Tirlet and the engineers underGuillaume Dode de la Brunerie took up positions before Cádiz from mid-July. Forced to use several naval divisions for surveillance of Spain's Atlantic and Mediterranean ports and coasts (held by the Constitutionalists), the French navy was able to spare only a small squadron of 10 ships underCounter-AdmiralJacques Félix Emmanuel Hamelin to blockade the city. That proved too small a force for Hamelin to succeed in this mission and so on 27 August he was replaced by Counter-Admiral des Rotours, then byDuperré, who arrived only on 17 September, with meagre reinforcements.

On 31 August the French infantryassaulted Fort de Trocadero and successfully captured it at the cost of 35 killed, 110 wounded (with 150 dead, 300 wounded, 1,100 captured among the garrison), turning its powerful guns towards Cádiz. On 20 September, Fort Sancti-Petri fell in its turn in a combined army–navy operation. On 23 September, the guns of the Sancti-Petri and Trocadero forts and of Duperré's fleet bombarded the town and on 28 the constitutionalists adjudged the town lost. Thus, the Cortes decided to dissolve itself, give back absolute power to Ferdinand VII and hand him over to the French. On 30 September Cádiz surrendered and on 3 October more than 4,600 French troops landed at its port. The French army fired its last shots in Spain at the start of November. On 5 November, the Duke of Angoulême left Madrid and re-entered France on 23 November, leaving behind an occupying force of 45,000 men under the command ofBourmont. Spain was then progressively evacuated, but the French withdrawal was fully completed only in 1828.

France's role in aiding to Ferdinand was key. The liberals thus negotiated their return in exchange for Ferdinand's oath to respect the Spanish laws. However, on 1 October 1823, feeling bolstered by French forces, Ferdinand broke his oath and again repealed theConstitution of Cádiz and declared null and void all the acts and measures of the liberal government.

The war also seriously disturbed Spanish efforts to crush theindependence struggles in Hispanic America. The last Spanish forces in mainland South America were defeated in theBattle of Ayacucho in 1824.

Although the goals of the military campaigns in Spain were completely different,François-René de Chateaubriand,foreign minister in France's Villèle government (from 28 December 1822 to 6 June 1824), contrasted the expedition's successful aid in restoring the Spanish royalist withNapoleon's failure of subjugating and conquering Spain in thePeninsular War:

Striding across the Spains, succeeding where Bonaparte had failed, triumphing on the same soil where a great man's arms had suffered setbacks, doing in six months what he was unable to do in seven years, was a true miracle!^[3]

During theSpanish Civil War in the 1930s, thecarabineros ofRepublican Spain were nicknamed "The Hundred Thousand Sons ofNegrín".^[4]

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• Larousse, tome 1, 2, 3, Paris, 1998
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• Corvisier, André,Histoire militaire de la France, de 1715 à 1871, tome 2, Paris, Presses universitaires de France, "Quadrige" collection, 1998, 627 p.
• Demier, Francis,La France du XIXe 1814–1914, Seuil, 2000, 606 p.
• Dulphy, Anne,Histoire de l'Espagne de 1814 à nos jours, le défi de la modernisation, Paris, Armand Colin, "128" collection, 2005, 127 p.
• Duroselle, Jean-Baptiste,L'Europe de 1815 à nos jours : vie politique et relation internationale, Paris, Presses Universitaires de France,"Nouvelle clio" collection, 1967, 363 p.
• Garrigues, Jean, Lacombrade, Philippe,La France au 19e siècle, 1814-1914, Paris, Armand Colin, "Campus" collection, 2004, 191 p.
• Lever, Evelyne,Louis XVIII, Paris, Fayard, 1998, 597 p.
• Jean Sarrailh,Un homme d'état espagnol: Martínez de la Rosa (1787–1862) (Paris, 1930)

• Miguel Artola Gallego,La España de Fernando VII (Madrid, 1968)
• Jonathan Harris, "Los escritos de codificación deJeremy Bentham y su recepción en el primer liberalismo español",Télos. Revista Iberoamericana de Estudios Utilitaristas 8 (1999), 9–29
• W. Ramírez de Villa-Urrutia,Fernando VII, rey constitucional. Historia diplomática de España de 1820 a 1823 (Madrid, 1922)

• Raymond Carr,Spain 1808–1975 (Oxford, 1982, 2nd ed.)
• Charles W. Fehrenbach, "Moderados and Exaltados: the liberal opposition to Ferdinand VII, 1814–1823",Hispanic American Historical Review 50 (1970), 52-69
• Jonathan Harris, "An English utilitarian looks at Spanish American independence: Jeremy Bentham's Rid Yourselves of Ultramaria",The Americas 53 (1996), 217-33
• Ralph Weaver,The Hundred Thousand Sons of St Louis. The French Campaign in Spain April to October 1823, Helion & Company Limited 2018, ISBN 978-1-912174-09-6.

• Concert of Europe
• Congress of Verona
• Holy Alliance
• Ominous Decade
• Peninsular War

• http://www.onwar.com/aced/data/sierra/spain1820.htm
• http://www.thefreedictionary.com/Spanish+Civil+War

• Hundred Thousand Sons of Saint Louis
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