grognard
noun
gro·gnard
(ˌ)grō¦nyär
plural -s
1
: an old soldier
2
often capitalized : a soldier of the original imperial guard that was created by Napoleon I in 1804 and that made the final French charge at Waterloo
Word History
Etymology
French, from grogner to grunt, grumble (from Old French gronir, grogner, from Latin grunnire to grunt) + -ard