Wiktionary
grognard
n. 1 An old soldier. 2 (context games slang English) Someone who enjoys playing older war-games or roleplaying games, or older versions of such games, when newer ones are available.
Usage examples of "grognard".
His chivalrous courtesy, his unerring tact, his kindly nature, his unselfish and untiring devotion to their interests have all endeared him to those rough loyal natures, who would follow him with as much confidence and devotion as the grognards of the Guard had in the case of the Great Emperor.