Actually, at the end of the war of 1870 culminating with the humiliating surrender at Sedan, the Germans imposed a enourmous financial levy on the French intending to cripple their nation forever. The French paid it off in 3 years with one MASSIVE effort.
After that they resolved to never again be as defenseless and just prior to WW1 had amassed the largest and best trained army the French Republic had ever fielded (and would ever field again). It numbered about 1.5 Million men, not including reserve divisions. It was really only equalled by the German Army once they incorporated reserve units into the front line under the Schlieffen plan.
Their military spending after 1870 brought us the innovations of smokeless powder repeating rifles, modern close support field artillery, and the military use of the biplane. All things the other powers were fast to duplicate jsut to keep pace.