I also like that the "en" in the word "oxen" appears to be crossed out as if the writer of the message was unsure if the spelling was correct. If these are indeed WWI soldiers, even they needed some down time, and this is quite possibly how they spent one of those days.
Please inspect the pictures, as they give the best representation of condition. May have discoloring, edge or corner wear, marks, creases, fading, smudges, corner or edge bends, tears, or corners missing.