Einj. Freiw. Gefr. (One-year volunteer)
Konigl. Sachs. Ulanen Reg. 21. (Royal Saxon Uhlan Regiment No. 21)
Gefallen am 10. Oktober 1914 (killed 10 october 1914)
Ruhe in Frieden (Rest in peace)
It's a grave one-year volunteer, who was killed during World War I - Battle near Warsaw and Iwangorod (Deblin), when German 9th Army started offensive towards Warsaw.
Geocache is in a tree stump a few metres from the grave.
This geocache description comes from the Opencaching.PL site.