What is army bread?

Army bread is a type of hardtack, a dry, unleavened bread that was a staple of the military diet in the 19th and early 20th centuries. It was popular among soldiers because of its long shelf life and ease of transportation, and was often the only bread available to troops in the field. Army bread was typically made from wheat flour, water, and salt, and was often baked in large loaves or sheets. It was often broken into pieces and eaten dry, but could also be soaked in water, milk, or soup to soften it.