Hardtack, a soldiers best friend. Wild Bill spoke of many recipes that the troops used during the war. His favorite was to fry it up, crumbled with bacon fat or coffee. By frying it, the heat usually killed the bugs that might be in older hardtack, One industrious soldier even used one as a post card which he mailed home to his sweetheart in NY (bottom photo).
From Wildbillbourroughs on Tumblr