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At the outbreak of the War of the Pyrenees with the Kingdom of Spain, a decree of 30 April 1793 separated the Armée des Pyrénées into the Army of the eastern Pyrenees (Armée des Pyrénées orientales) and the Army of the western Pyrenees (Armée des Pyrénées occidentales).
Brenier enlisted in 1786 and gained rapid promotion during the period of the French Revolutionary Wars, becoming an aide-de-camp in 1792 and in 1793 a Chef de brigade (colonel) in the Army of the Eastern Pyrenees (Armée des Pyrénées orientales).