I confirm what I wrote, after reading Pigeard's dictionnaire de la Grande Armée.

Term first used 29/08/1805 (Correspondance de Napoléon N° 9158)

Disbanded by Décret impérial of 12/10/1808 (in Erfurt) and renamed Armée d'Allemagne under command of Davout.

Seconde Grande Armée created 15/02/1811 (Correspondance de Napoleon N° 17277)
" Cette second Grande Armée va combattre pendant les campagnes de Russie (1812), de Saxe (1813) et de France (1814)."
Pigeard, op. cit. pp.307-308.

Disbanded by the Senate's decree of 2/04/1814.

The term Armée de Champagne has never been used for the troops under Napoleon's command in 1814.