The first formation of this name was initially formed on 4 September 1792 under
Anne François Augustin de La Bourdonnaye within the
Army of the North and the
Army of the Centre - he held its command until 22 September that year. It was reorganised on 21 October 1792 to assist the 'camp sous Paris', suppressed the day before, and given
général Berruyer as its new commander. It became the
armée de Réserve on 1 March 1793 (when command of its right wing retained by Berruyer and command of its subordinate left wing given to
général Beaufranchet d'Ayat) then the
armée des côtes de la Rochelle on 30 April the same year, whilst retaining the same organisation and commanders -
général Leigonyer and d'Ayat commanded its right and left wings respectively from 29 April to 27 May as interim commanders.
Armand Louis de Gontaut-Biron commanded the unit from 28 May until 16 July 1793. It then had no commander until
Jean Antoine Rossignol's appointment on 31 July - for those two weeks
général Pilotte commanded its right division and
Alexis Chalbos its left division. Rossignol held command for the rest of the unit's existence, barring 25 to 30 August 1793, when he was temporarily replaced by
Antoine Joseph Santerre. On 2 October 1793 the
French Convention decreed the merger of the
army of Mayence with the part of the
armée des côtes de la Rochelle operating in the
Loire-Inférieure department - this new formation was named the
Army of the West. ==1795-1796==