Don, as to the rest of the card...across the top are the first two lines of the traditional German military burial/death hymn "Ich hatt' einen Kameraden, einen bessern findst du nicht" (I had a comarde, a better one can't be found).
On either side of the center piece, "Zum Gedaechtnis - treuer Kameraden" (In memory of loyal comrades). The tablets left and right appear to list names and dates of death of indivdual soldiers. I'm not able to read clearly due to the size.
https://www.youtube.com/watch?v=kyBiQaVyLMM