This paper focuses on evidence from firewood remains from a Napoleonic camp located at Étaples (in the north of France), inhabited between 1803 and 1805. The combination of archaeological and relevant historical records indicates that wood resources, stockpiled for lighting and heating by the soldiers, may have originated from two distinct areas: the army's official forest and also the area around the camp, indicating possible difficulties in wood supply at the end of its occupation. This study, therefore, uses archaeological charcoal to reinforce military historical sources in understanding firewood economy and the harsh everyday life of the Napoleonic soldier at the beginning of the nineteenth century.