At the Battle of Peyrestortes (17 September 1793) in the War of the Pyrenees, soldiers of the First French Republic defeated a Spanish army that had invaded Roussillon and was attempting to capture Perpignan. The Spanish army of Antonio Ricardos had occupied part of Roussillon and made an abortive attempt to seize the fortress of Perpignan in July 1793. At the end of August, the Spanish commander sent two divisions on a sweep around the western side of Perpignan in an attempt to isolate the fortress and choke it off from resupply. After an initial Spanish success, the French army commander Hilarion Paul Puget de Barbantane, lost his nerve and fled from the area.

Eustache Charles d'Aoust and Jacques Gilles Henri Goguet assumed command and attacked two divisions of the Army of Catalonia led by Juan de Courten and Jernimo Girn-Moctezuma, Marquis de las Amarillas. The Spanish were routed and never again advanced so far into Roussillon. After the battle, the Army of Catalonia found itself back in its original positions. Ricardos successfully defended a Spanish foothold in France during the remainder of 1793. Peyrestortes is located 7 kilometres (4.3 mi) northwest of Perpignan.

The Army of the Eastern Pyrenees (Armée des Pyrénées Orientales) was one of the French Revolutionary armies. It fought against the Kingdom of Spain in Roussillon, the Cerdanya and Catalonia during the War of the Pyrenees. This army and the Army of the Western Pyrenees were formed by splitting the original Army of the Pyrenees at the end of April 1793 soon after the war started. Shortly after the Peace of Basel on 22 July 1795, the fighting ended and the army was dissolved on 12 October that same year. Many of its units and generals were transferred to join the Army of Italy and fought under Napoleon Bonaparte in 1796.

In the first dismal months of fighting, the Army of the Eastern Pyrenees was beaten at Mas Deu and Bellegarde and forced back under the walls of Perpignan. Then the French repelled two Spanish attacks at Perpignan and Peyrestortes. Though the army was defeated again at Truillas and in other actions, the Spanish invaders withdrew to the Tech River in late 1793. Throughout the year the representatives on mission had enormous powers and used them to interfere with the military effort and to arrest officers that they deemed unpatriotic or unsuccessful. In 1794, the army's fortunes improved when Jacques François Dugommier took command. The army drove the Spanish army from France soil at Boulou and recaptured the Fort de Bellegarde and Collioure. After establishing itself on Spanish territory, the army won a decisive victory at the Battle of the Black Mountain in November during which Dugommier was killed. His replacement, Dominique Catherine de Pérignon soon captured the Sant Ferran fortress and the port of Roses. After these events the front became static and the last notable action was a Spanish victory at Bascara in June.

The war took a severe toll on the commanders of the Army of the Eastern Pyrenees. Aside from Dugommier's death in battle, three were executed by the guillotine and another died of disease. Five officers from the army later became Marshals of France under Napoleon. These were Pérignon, Pierre Augereau, Claude Perrin Victor, Jean Lannes and Jean-Baptiste Bessières.