Luis Fermín de Carvajal, 1st Count of la Unión (1752 – 20 November 1794) became a general officer in the army of the Kingdom of Spain.

[1] When Ricardos died in Madrid in early 1794, and his successor, Alejandro O'Reilly, soon after, King Charles IV of Spain appointed de la Unión to command the army.

In April 1794, the newly organized and reinforced French Army of the eastern Pyrenees under Jacques François Dugommier launched a powerful offensive against the Spanish foothold in France.

[2] The French recaptured the port of Collioure at the end of May,[3] and blockaded the Spanish garrison of the Fort de Bellegarde at the Pass of Le Perthus.

A Spanish artillery shell killed Dugommier on the 18th and his successor Dominique Catherine de Pérignon ordered a temporary halt in the fighting.

[9] Jerónimo Girón-Moctezuma, Marquis de las Amarillas succeeded to the army command and retreated south of the Rio Fluvià where he was unable to save the fortress of San Fernando from capture.