Why the Siege of Cádiz Held Off Napoleon for Thirty Months
During the Siege of Cádiz from 1810 to 1812, islands, batteries and 17,000 Allied troops defied Napoleon while the Cortes wrote Spain's first Constitution.
Historian specialising in Cádiz's ancient, colonial and constitutional heritage.
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For thirty months between 5 February 1810 and 24 August 1812, Napoleon's troops tried and failed to take the island port of Cádiz.[1] After the Duke of Albuquerque marched 10,000 Spanish soldiers inside and five Anglo-Portuguese battalions raised the garrison to 17,000 men, the city held out along a defensive line visitors can still trace at the Fuerte de La Cortadura in Extramuros and the Puerta de Tierra ramparts.[2][3] Behind those bastions, the besieged parliament met at the Oratorio de San Felipe Neri, remembered next door inside the Museo de las Cortes de Cádiz.[4]
Allied garrison by Feb 1810
17,000
Albuquerque's 10,000 men joined by five Anglo-Portuguese battalions[2][3]
French Grand Mortar range
5 km
Heavy artillery cast to bombard Cádiz across the bay waters[5]
Burst by retreating French
600 guns
Overcharged and detonated when the siege ended on 24 August 1812[6]
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How Albuquerque and the tidal channel stopped Victor in February 1810
When the French armies of Marshals Soult and Victor swept down into Andalusia in early 1810, they encircled the Bay of Cádiz on land from three entrenched positions at Chiclana, Puerto Real and Santa Maria.[7] Inside the port, only four battalions of volunteers and recruits stood ready to man the Puerta de Tierra, the coastal Castillo de Santa Catalina and the city ramparts.[2][8] The city survived that first week because the Duke of Albuquerque set aside the Junta Suprema Central's orders to fight Victor's much larger force in the open and brought 10,000 troops across into the island defences instead.[2]
By mid-February 1810, five Anglo-Portuguese battalions disembarked in the harbour, lifting the defending garrison to 17,000 men and making the position virtually impregnable.[3] Geography did the rest. Before any attacker could reach the narrow sandspit of Cádiz, they had to cross onto the outer island at Puente Zuazo, where defenders demolished the bridge's central arch so the French finally withdrew after failing to force a crossing.[9]
Timeline
5 Feb 1810
French blockade begins
Marshals Soult and Victor close the landward semicircle around the Bay of Cádiz.[1][7]
24 Sep 1810
Cortes open on the Isla de León
Deputies hold their first parliamentary session in the Teatro Cómico in modern San Fernando.[4]
24 Feb 1811
Parliament moves into Cádiz
The Cortes reconvene inside the Oratorio de San Felipe Neri in the walled old city.[4]
5 Mar 1811
Battle of Barrosa
Marshal Victor attacks the Anglo-Iberian relief expedition near Chiclana; the British 87th captures a French Imperial Eagle.[12][13]
24 Aug 1812
French lift the siege
After an overnight barrage, French gunners burst most of their 600 cannon and retreat from the bay.[1][6]
Behind that water barrier, military engineers sealed the sandy southern isthmus into Cádiz proper by building the Fuerte de San Fernando de La Cortadura.[10] Although the original design called for five bastions, builders completed three: Santa María and San José across the main landward front behind a flooded moat, and Infante Don Carlos guarding the southern shore.[10] Later roadworks for the modern Cádiz–San Fernando highway cut the fort in two, though a plaque on the western flank of the San José bastion still records its wartime construction and 1970 restoration.[11]
Crossfire at Puntales, Matagorda and the five-kilometre Grand Mortars
With the southern bridge and isthmus blocked, the struggle shifted to the inner mouth of the bay. There the Castle of San Lorenzo del Puntal closed the sea passage toward the inner bay and the La Carraca naval arsenal by crossing cannon fire with Fort Matagorda on the opposite mainland shore.[14] French batteries concentrated heavy fire on Matagorda until the mainland fort became untenable and the defending British 94th Regiment of Foot had to evacuate it.[15]
Losing Matagorda brought French gunners within range of the inner harbour and exposed San Lorenzo del Puntal to a battering so severe that the castle later required a major structural restoration in 1862 and 1863, which gave the fort its present shape.[16] To reach the crowded streets of Cádiz itself across the water, the French cast some of the largest artillery pieces then in existence, Grand Mortars capable of hurling projectiles up to 5 kilometres (3 miles), a distance previously considered impossible.[5]
Those huge mortars were too heavy to haul away when the blockade finally collapsed.[5] The French abandoned them. One captured mortar was later presented to the British in honour of the Duke of Wellington and set up in St. James's Park in London.[17]
Parliament under fire: from the Isla de León to San Felipe Neri
While French shells arced across the bay, besieged Cádiz functioned as the political capital of unoccupied Spain. On 24 September 1810, the Cortes Generales y Extraordinarias held their opening session at the Teatro Cómico on the Real Isla de León, today's San Fernando.[4] Walk out to the Baluarte de la Candelaria on the northern bay front today and you can see how closely the city's seaward fortifications sat to the parliamentary quarter.
Five months later, on 24 February 1811, the deputies moved across the isthmus into the Oratorio de San Felipe Neri inside the walls of Cádiz, where they continued sitting until 25 September 1813.[4] Inside that oval baroque church, parliament drafted and proclaimed the 1812 Constitution that shaped nineteenth-century liberal Cádiz. Bombs fell outside while the deputies voted.
Protecting that parliament on the landward side of the old city stood the Puerta de Tierra, a curtain wall flanked at its ends by the San Roque and Santa Elena bastions with a central watchtower marking the main axis.[8]
The Battle of Barrosa and the lifting of the blockade in August 1812
In February and March 1811, an allied Anglo-Iberian relief force sailed out to break the French blockade from the rear.[12] On 5 March 1811, Marshal Victor attacked the expedition near Barrosa (also known in Spain as the Battle of Chiclana).[12][13] During the fighting, the French 8th Line Regiment lost half its men, and Ensign Keogh of the British 87th Regiment died seizing its Imperial Eagle before Sergeant Patrick Masterson secured the standard, the first French eagle won by British troops in the Peninsular War.[13]
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Barrosa cost the French nearly 2,380 casualties, against roughly 1,240 troops under British command (including Portuguese and German soldiers) and between 300 and 400 Spanish losses.[18] Yet the siege held.
What finally ended the blockade was the wider war across Iberia. By 1812, the French had more than 350,000 soldiers in the peninsula, yet 200,000 of them were tied down guarding supply lines rather than fighting at the front.[19] When Allied victories in the summer campaign threatened to cut the French off in Andalusia and southern Spain, the besiegers had to pull out.[20] After firing a final overnight barrage before 24 August 1812, French gunners deliberately overcharged and detonated most of their 600 guns, leaving behind 30 gunboats and vast military stores for the Coalition.[1][6]
You can walk the surviving inner defences and museum rooms of the 1810–1812 siege in a single morning inside the old town, then follow the isthmus south toward San Fernando for the outer forts. Begin at the Museo de las Cortes de Cádiz, whose full title, the Museo Iconográfico e Histórico de las Cortes y Sitio de Cádiz, pairs the parliament with the military blockade.[21]
Inside, the museum's Sala del Asedio focuses directly on how Cádiz and the Isla de León defended themselves against Napoleon's armies.[22] Its centrepiece is a three-dimensional relief model of the walled city built at roughly 1:250 scale between July 1777 and March 1779 by artisans working under the military engineer Alfonso Ximénez for King Charles III.[23] Study that mahogany plan first, then cross Plaza de San Juan de Dios toward the landward wall along these four stops:
Museo de las Cortes de Cádiz: displays 18th- and 19th-century weapons, medals, flags, constitutional editions, portraits of the Junta Superior de Defensa y Gobierno, and uniform models of the Voluntarios Distinguidos militia corps.[21][22]
Oratorio de San Felipe Neri: stands immediately next door to the museum and preserves the church chamber where the Cortes met from 24 February 1811 to 25 September 1813.[4]
Puerta de Tierra: climb the central vault, turret and upper rampart walkway, reopened to visitors since 2013, to look down the isthmus between the San Roque and Santa Elena bastions.[8][24]
Fuerte de La Cortadura: stop along the southern beach highway to see the surviving Santa María, San José and Infante Don Carlos bastions and the commemorative plaque on the western wall of San José.[10][11]
Frequently asked questions
How long did the Siege of Cádiz 1810 last?
The Siege of Cádiz 1810 began on 5 February 1810 and lasted for two and a half years until the French army retreated on 24 August 1812.[1]
Why did Napoleon's army fail to capture Cádiz?
The Duke of Albuquerque reinforced the city with 10,000 Spanish soldiers just before the French arrived, and five Anglo-Portuguese battalions soon raised the garrison to 17,000 men. Protected by the demolished arch at Puente Zuazo, the flooded moat at Fuerte de La Cortadura and the waters of the bay, the island city could not be stormed.[2][3][9][10]
How far could the French Grand Mortars fire during the siege?
The French deployed some of the largest artillery pieces then in existence, known as Grand Mortars, which could fire shells up to 5 kilometres (3 miles). They were so heavy that the French abandoned them when they retreated, and one now stands in St. James's Park in London.[5][17]
What happened at the Battle of Barrosa on 5 March 1811?
An Anglo-Iberian relief expedition tried to break the French blockade from the rear, and Marshal Victor attacked them near Barrosa on 5 March 1811. British and Spanish troops inflicted around 2,380 French casualties and the British 87th Regiment captured the Imperial Eagle of the French 8th Line, though the siege itself continued.[12][13][18]
Where did the Cortes of Cádiz meet during the French bombardment?
The Cortes Generales y Extraordinarias held their first session on 24 September 1810 in the Teatro Cómico on the Real Isla de León (modern San Fernando), then moved on 24 February 1811 to the Oratorio de San Felipe Neri inside Cádiz, where they met until September 1813.[4]
Where can you see objects and fortifications from the siege in Cádiz today?
Visit the Sala del Asedio and the 1777–1779 city scale model at the Museo de las Cortes de Cádiz next to the Oratorio de San Felipe Neri, walk the upper ramparts of the Puerta de Tierra (reopened in 2013), and view the bastions of the Fuerte de La Cortadura on the highway toward San Fernando.[11][22][23][24]
“Aunque inicialmente estaba guarnecida por solo cuatro batallones de voluntarios y reclutas, la decisión del duque de Albuquerque de posponer las órdenes de la Junta Suprema Central de atacar a las fuerzas de Victor, muy superiores en número, permitió reforzar la ciudad con 10 000 hombres.”
“a mediados de febrero de 1810 cinco batallones anglo-portugueses desembarcaron en Cádiz, elevando el número de tropas defensoras hasta 17 000 hombres, lo que hacía inexpugnable la ciudad.”
“Las Cortes Generales y extraordinarias celebran su primera sesión el 24 de septiembre de 1810 en el Teatro Cómico de la Real Isla de León (actual ciudad de San Fernando, Cádiz). A partir del 24 de febrero de 1811y hasta el 25 de septiembre de 1813 se reúnen en el Oratorio de San Felipe Neri, en la ciudad de Cádiz.”
“The ensuing bombardment of the Spanish coastal city involved some of the largest artillery pieces in existence at the time, including Grand Mortars, which were so large they had to be abandoned when the French eventually retreated, and fired projectiles to distances previously thought impossible, some up to 5 kilometres (3 miles) in range.”
“After an overnight artillery barrage, the French intentionally burst most of their 600 guns by overcharging and detonating them. The Coalition forces captured many guns, 30 gunboats and a large quantity of stores.”
“The port of Cádiz was surrounded on land by the armies of Soult and Victor, in three entrenched positions at Chiclana, Puerto Real and Santa Maria, positioned in a semicircle around the city.”
“La fortificación está compuesta por una línea de muralla rematada en sus extremos por los baluartes de San Roque y Santa Elena. En el centro se sitúa un torreón que marca el eje central.”
“Hasta 1812, hubo que destruir el arco central del puente de Zuazo para evitar definitivamente el paso a los franceses, que terminaron retirándose ante la imposibilidad de cruzar.”
“El proyecto original contemplaba un conjunto de cinco baluartes del que sólo se acabaron tres: Santa María, San José e Infante D. Carlos. Los dos primeros formarían el frente principal, reforzándose su protección con un foso inundado, mientras que el tercero estaba destinado a la defensa de la costa y del sector meridional del castillo.”
“El fuerte fue cortado en dos por el trazado de la actual carretera Cádiz-San Fernando. En el lateral W del baluarte de San José se dispuso una placa que recuerda tanto las circunstancias históricas de su construcción como su restauración en 1970.”
“In February-March 1811, an Anglo-Iberian force tried to break the French blockade of the vital southern Spanish port of Cádiz. On 5 March, the French under Marshal Victor attacked this relief force near Barrosa.”
“El 8.º de Línea francés, parte de esa columna, sufrió un 50 % de bajas; el águila imperial, estandarte de esta columna, fue capturada por el alférez Keogh, del 87.º regimiento, quien murió en el intento, y el sargento Patrick Masterson (o Masterman, según otras fuentes) lo cogió, siendo el primero en ser ganado por los británicos en la guerra de Independencia española.”
“Su principal misión consistía en cerrar el paso al interior de la Bahía y al Arsenal de la Carraca. Para ello el fuego de sus cañones debía actuar en conjunto con los situados en el Fuerte de Matagorda (San Fernando, Cádiz), localizado al otro lado de la Bahía.”
“The fortress of Matagorda, north of Cádiz, was bombarded by the French. When the fort became untenable, it was evacuated by the defending 94th Regiment of Foot.”
“Los daños sufridos durante el asedio francés a Cádiz en el marco de la Guerra de la Independencia, ocurrido entre los años 1810-1812, motivó su restauración entre 1862 y 1863, dándole la configuración que podemos observar en la actualidad.”
“Las tropas británicas perdieron aproximadamente 1240 soldados, incluyendo portugueses y alemanes bajo mando británico. Las bajas españolas fueron entre 300 y 400. Los franceses perdieron cerca de 2380 hombres.”
“El Museo Iconográfico e Histórico de las Cortes y Sitio de Cádiz, que es el nombre completo, alberga numerosos objetos de los siglos XVIII y XIX, la mayoría de los cuales están vinculados al asedio de la ciudad por parte de las tropas napoleónicas entre 1810 y 1812 y la promulgación de la Constitución de 1812: armas, copias de constituciones, medallas, banderas ...”
“Desde aquí se accede a la “Sala del Asedio” centrada en la defensa de Cádiz y de la Isla de León -hoy ciudad de San Fernando- de las tropas napoleónicas durante la Guerra de la Independencia española. En ella destaca la colección de modelos con los uniformes de los cuerpos de los Voluntarios Distinguidos, la galería de retratos de algunos miembros de la Junta Superior de Defensa y Gobierno así como la colección de armas del conflicto bélico.”
“Dicho modelo tridimensional, a escala 1/250 aproximadamente, refleja el estado del intramuros de Cádiz a comienzos del último cuarto del siglo XVIII. Fue realizado, a instancias del rey Carlos III, por un amplio equipo de artesanos dirigido por el ingeniero militar Alfonso Ximénez (entre julio de 1777 y marzo de 1779).”
“The central vault, turret and upper walkway of Puerta Tierra, the inland gateway, which has been reopened to the public since 2013, are the main features of a structure of great cultural, historical and heritage significance.”