Franco-Prussian War

My paternal Great-Grandfather was a combatant in the East Prussian army against the French in 1870/71. According to family legend, he was taken prisoner by the French, and had to walk back to East Prussia after his release.

I would like to be able to confirm that he had indeed been taken prisoner.

Does anyone know: - Did the French keep records of Prisoners of War?
                              - If so, where would one write for information?

  ~ Glenn Krock, Canada

Glenn - my paternal G-Grandfather was also in the Franco-Prussian war, and
lost
his leg. I have not been able to find any records of any soldiers, active
or disabled.
Do you know which regiment he served in? and where he enlisted?
Muriel
Canada