Gallic red and blue
I am always struck by how the French Army of 1870 looked remarkably similar to the French Army of 1914.
Observe this French soldier by a cannon on 23 July 1870 in the Franco-Prussian War via Brown University:
Compare the above to this image:
1914 – Lyon (Rhône), French soldiers of the 14e Escadron du Train des Équipages Militaires ready their equipment. Mobilized in August 1914, the formation, the support train for the 14th Army, totaled 7,215 men, 8,250 horses, and 2,346 assorted voitures (vehicles.) During the conflict, the support unit recorded no less than 469 men “Mort pour la France, honorifique posthume.“

