Jean Joseph Guieu, also Jean Guyeux, joined the French royal army and quickly rose in rank during the French Revolutionary Wars. He fought in the War of the Pyrenees against Spain and became a general officer. After transferring to Italy, he held important commands under Napoleon Bonaparte in the Italian campaign of 1796-1797. He retired from the army in 1803 and his surname is one of the Names inscribed under the Arc de Triomphe.

The Army of the Eastern Pyrenees 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.