The Battle of Boulou: French forces defeat a Spanish army under General Union during the War of the Pyrenees

The War of the Pyrenees, also known as War of Roussillon or War of the Convention, was the Pyrenean front of the First Coalition's war against the First French Republic. It pitted Revolutionary France against the kingdoms of Spain and Portugal from March 1793 to July 1795 during the French Revolutionary Wars.

The war was fought in the eastern and western Pyrenees, at the French port of Toulon, and at sea. In 1793, a Spanish army invaded Roussillon in the eastern Pyrenees and maintained itself on French soil through April 1794. The French Revolutionary Army drove the Spanish Army back into Catalonia and inflicted a serious defeat in November 1794. After February 1795, the war in the eastern Pyrenees became a stalemate. In the western Pyrenees, the French began to win in 1794.