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).
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He served with distinction in various campaigns of the Revolutionary Wars, in Italy and in Holland.
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Born in Milan, he served through the Italian campaign of 1796-97, and subsequently, like Franceschi-Delonne, with Masséna at Zurich and at Genoa, and at the headquarters of King Joseph Bonaparte in Italy and Spain.
In July 1793 he was president of the Convention, entered the Committee of Public Safety the same month and was sent on mission to the Armies of the East fighting in the Revolutionary Wars.
During the French Revolutionary Wars, he served in the Imperial Army of the Upper Rhine, under command of General of Cavalry Dagobert Sigmund von Wurmser.