In 1914, the regiment garrisoned in Paris and belonged to the 5th colonial brigade of the 3rd Colonial Infantry Division 3ᵉ DIC.

The 21ᵉ RIC was principally engaged Champagne, on the Somme and the Chemin des Dames and was cited in the Order of the Day four times.
On November 24, 1918, the regiment was awarded the Fourragere with colors bearing the Médaille militaire.
In 1914, the regiment garrisoned in Paris and belonged to the 5th colonial brigade of the 3rd Colonial Infantry Division 3ᵉ DIC.
The 21ᵉ RIC was principally engaged Champagne, on the Somme and the Chemin des Dames and was cited in the Order of the Day four times. On November 24, 1918, the regiment was awarded the Fourragere with colors bearing the Médaille militaire.
21st Marine Infantry Regiment