I put a piece about this French group Association UNIF-EUROP 19 up on this blog in 2005 but it seems only fair to put this link up again alongside all the others. There's lots of interesting links on the site including one to this film La forteresse assiégée Un film de Gérard Mordillat - a docu-drama set during the Franco-Prussian war. Also this site dedicated to photos of the era including some beautiful colour photos.