A Yankee in the Trenches by Robert DerHolmes

I cannot end this book without saying something to those who have boys over there and, what is more to the point, to those boys who may go over there.

First as to the things that should be sent in parcels; and a great deal of consideration should be given to this. You must be very careful not to send things that will load your Sammy down, as every ounce counts in the pack when he is hiking, and he is likely to be hiking any time or all the time.