John D. Billings, Hardtack and coffee (1887)
“ Then there were a few men in every organization who engaged in no pastimes and joined in no social intercourse. These men were irreproachable as soldiers, it may have been, doing without grumbling everything that was expected of them in the line of military or fatigue duty, but they seemed shut up within an impenetrable shell, and would lie on their blankets silent while all others joined in the social round; or, perhaps, would get up and go out of the tent as if its lively social atmosphere was uncongenial, and walk up and down the parade or company street alone. ”
