10. Barley Gruel
Barley gruel, a porridge made from boiled barley and water, was a staple for Roman legionaries and medieval European armies. (resmilitares.com) Its high fiber and slow-digesting carbohydrates provided sustained energy during long marches. (fchsmuseum.com) The gruel could be flavored with available ingredients, making it a versatile and essential part of soldiers’ diets.
