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Firecake is a mixture of flour & water (with salt if the soldiers happened to have it). You mix the ingredients together, form it into a cake & bake it on a rock in the fire or over the fire, usually in the ashes until blackened. You can make a form of it at home by taking some flour & a little salt. Mix with water until you make a thick, damp dough. You don't want it to be too sticky. Form it into a flat cake in the palm of your hand & put it on a greased cookie sheet & bake until brown. You could also just drop "globs" of the dough onto the cookie sheet & let them bake like cookies. The final product will be a very hard, not very tasty "biscuit" that served as food for the soldiers during the Revolutionary War when their regular rations were not available.