During the War in Croatia from 1991 to 1992, we conducted an epidemiological study of the most frequent skin changes on the feet of 1,702 Croatian soldiers stationed in trenches and exposed to direct war activities. We saw significant increases in dermatomycosis, hyperhydrosis, and mechanical injury to the skin of the feet. Soldiers involved in this study did not have any specific medications or powders available as standard gear to prevent any of these foot diseases, but upon physical examination they received treatment. We can conclude that, in war situations, conditions are sufficient to cause an increased number of dermatomycosis, hyperhydrosis and chronic mechanical injuries of the foot. This study suggests the need for planned prevention to avoid these foot diseases in combat situations.