Spanish reconquest of New Granada

The Spanish reconquest of New Granada in 1815–1816 was part of the Spanish American wars of independence in South America and Colombian War of Independence. Shortly after the Napoleonic Wars ended, Ferdinand VII, recently restored to the throne in Spain, decided to send military forces to retake most of the northern South American colonies, which had established autonomous juntas and independent states. The Spanish expeditionary army under the command of Lieutenant General Pablo Morillo, with support from loyal colonial troops, completed the reconquest of New Granada by taking Bogotá on 6 May 1816.

The expeditionary force and campaigns
In 1814, with King Ferdinand VII back on the Spanish throne, Spain decided to send to its most seditious colonies the strongest expeditionary force that it had ever sent to the Americas, this force was known as the Expeditionary army of Costa Firme (Spanish: Ejército Expedicionario de Costa Firme). Then Field Marshall Pablo Morillo later promoted to Lieutenant General, a veteran of the Spanish struggle against the French, was chosen as its commander with Admiral Pascual Enrile as second in command and commander of the naval forces. The expeditionary force was made up of approximately 10,000 men and nearly 60 ships. Originally, they were to head for Montevideo in the Viceroyalty of the Río de la Plata, but soon it was decided to send these forces to the Viceroyalty of New Granada (present-day Colombia, Ecuador, Panama) and Venezuela.

Leaving the port of Cádiz on 17 February 1815, the force initially landed at Carupano and the island of Margarita in April, where no resistance was encountered. After leaving the island, Morillo's troops reinforced existing royalist forces in the Venezuelan mainland, entering Cumaná and Caracas in May. A small part of the main corps set off towards Panamá, while the main contingent was directed from Puerto Cabello towards the Neogranadine coastal city of Santa Marta which was still in Royalist hands.

Arrival in New Granada – July 1815
The expeditionary forces arrived on the Neogranadine coast on 23 July, arriving in Santa Marta, there Morillo's forces picked up supplies as well as militia volunteers. Morillo's main objective and main effort would be concentrarted on capturing the republican fortress city of Cartagena, which was the most important port in all of the colony.

Prior to setting out for Cartagena, Morillo ordered that Brigadier Pedro Ruiz de Porras take 1,000 troops composed of the battalions Fijo de Puerto Rico, Granada, and some elements of the Albuera battalion and a squadron of hussars. This advance force would penetrate the interior of the country and capture the important river port of Mompox which lay on the Magdalena River. Another royalist force would also support Morillo's invasion, that being 2,100 Venezuelan royalist troops of the V division under the command Colonel Sebastian de la Calzada who would invade from the east in Venezuela.

Siege of Cartagena
By mid August, Morillo and his forces set sail and arrived off Cartagena, the city was defended by some 4,000 troops under the command of General Manuel del Castillo y Rada amongst the troops were the Honor guard battalion, Militia units, as well as Venezuelan and foreign troops along with a contingent of dragoons and carabiners. There were also between 400 to 300 artillery troops to man the 400 artillery pieces that dotted the impressive fortifications that defended the city. For the next five months, the Spanish laid a brutal siege that devastated the civilian population however the defenders stubbornly held out.

By November however the siege began to take a toll on the Spanish and their expeditionary troops began to suffer from tropical diseases, as Morillo had lost his siege train equipment when the ship San Pedro blew up off the coast of Venezuela earlier that year, he began to order more offensive operations against the fortifications of the city. By early December, Morillo demanded the surrender the fortified city, at a council of war, the defenders of Cartagena decided not to capitulate, but to try to get out of the besieged city by sea and head towards Jamaica or Haiti. On the night of 5 December, the Cartagena authorities and some of the defenders set sail on ships, many of them corsairs, others merchant ships, under command of the French corsair Louis-Michel Aury. Of the nearly 2,000 people who left on 6 merchant ships and 10 armed schooners, only 600 people managed to reach Haiti. Many ships sank, ran aground or returned to port and were captured by the Spaniards. The fortified city finally fell on December 6, 1815.

Cachirí Campaign
While Cartagena was under siege, on 18 October 1815, Colonel Calzada's V division began their invasion of New Granada setting out from the town of Guasdualito, crossing the Arauca River and penetrated the eastern llanos of the Casanare Province of New Granada. The only republican army in the vicinity was the Army of the East under the command of Colonel Joaquín Ricaurte who had at his disposal 150 infantrymen and 1,000 cavalry. Ricaurte intercepted Calzada's forces on 31 October in an area called Chire. The republicans were victorious however Calzada’s troops were able to escape destruction as Ricaurte’s cavalry did not press their attack but instead focused on looting their defeated enemy. Despite escaping total destruction Calzada's forces had suffered 200 dead and around 300 captured and missing as a result of the battle, nevertheless he continued his invasion pivoting northward and crossed the Cordillera Oriental of the Andes through the Chita Pass into the Tunja Province with aims of marching towards Cúcuta.

By early 1816, the combined efforts of Spanish and colonial forces, marching south from Cartagena and north from Royalist strongholds in Quito and Pasto completed the reconquest of New Granada. Colonel Sebastián de la Calzada won the Battle of Cachirí in February 1816 and took the Republican capital Bogotá on 6 May 1816. The Republican government fled to Popayán, but their last stronghold was also captured after their defeat in the Battle of Cuchilla del Tambo on 29 June 1816.

Captured units of the Republican armies of New Granada were incorporated into the Royalist army and sent to the Viceroyalty of Peru.

Reign of Terror
A permanent consejo de guerra was set up to judge those accused of treason and rebellion, resulting in the execution of more than a hundred notable Republican officials, including:
 * Jorge Tadeo Lozano, former president,
 * Francisco José de Caldas, Colonel and Military engineer,
 * Manuel de Bernardo Álvarez, former president of Cundinamarca,
 * Joaquín Camacho, former member of the Triumvirate,
 * Custodio García Rovira, former president,
 * Liborio Mejía, former president,
 * Manuel Rodríguez Torices, former member of the Triumvirate,
 * Camilo Torres Tenorio, former president,
 * Antonio Villavicencio, former member of the Triumvirate,
 * José María García de Toledo, former president of the Junta of Cartagena de Indias
 * Mercedes Abrego, for aiding Revolutionary guerrilleros,
 * Policarpa Salavarrieta, for spying,
 * María Antonia Santos Plata, for organizing a guerrilla group,
 * Antonio Baraya, military leader,
 * Manuel del Castillo y Rada, military leader,
 * José María Cabal, military leader,
 * Carlos de Montúfar, military leader,
 * José de Ayala y Vergara, military leader.

It is estimated that in total, some 7,000 people were executed by the Spanish between 1816 and 1819.

Patriot reactions
On learning of the arrival of the expeditionary force, republican leaders assumed various positions. Internal divisions, which had developed during the previous years of struggle, softened but still remained a considerable obstacle. In the end, they prevented a coordinated effort by the different factions, although there were some attempts to do so, such as under the United Provinces of New Granada. One significant factor in the disunity was that representatives of the United Kingdom and of the United States refused to grant political recognition and would not commit the sufficient amount of economic and military aid to successfully resist Morillo's force. In addition, the provinces themselves did not give each other much-needed aid. Finally, several notable individuals, whose leadership would have been useful, decided to exile themselves, although other republican leaders remained in the region and tried to reorganize their military and political activities in order to face the new threat.

As a result of the internal conflicts in New Granada, Simón Bolívar, who had been acting under the authority of the United Provinces, left his command on 8 May 1815, after failing to subdue Cartagena in March in retaliation for its refusal to give him arms and men. Bolívar traveled to Jamaica and later Haiti, a small republic that had freed itself from French rule, where he and other independence leaders were given a friendly reception. Eventually, the growing exile community received money, volunteers and weapons from Haitian president Alexandre Pétion, and resumed the struggle for independence in the remote border areas of both New Granada and Venezuela, where they established irregular guerrilla bands with the locals. This formed the basis from which the struggle to establish republics successfully spread towards the other areas of South America under Spanish control.