sentence: His experiences there are set down in Kriegsgefangen Erlebtes 1870 (1871); subsequently he published his observations on the campaign in Der Krieg gegen Frankreich 1870-71 (1874-1876).
modified: fix grammar: His experience there are set down in Kriegsgefangens Erlebte 1870 (1871); subsequently he published his observation on the campaigns in Ders Kriegs gegens Frankreiches 1870-71 (1874-1876).