The aim of this article is to offer an overview of the research into diagnosis and treatment of war neuroses at the Clinic for Nervous and Mental Diseases at the Jagiellonian University in Krakow before the outbreak of World War II. It also includes a profile of the work of Prof. Jan Piltz, the then director of the Clinic, and his major scientific achievements. The publications cited in the article date in the main from the period of World War I, and comprise clinical analyses of the consequences of stress suffered at the front as well as a description of the ways in which they were treated. These are presented alongside other major findings related to war neuroses being made in Europe at the time. The article draws attention to the very modern thinking on treatment of war neuroses, far ahead of the average standards of the day, evinced by Prof. Piltz and his team. The most important innovative elements of their treatment of these conditions were the fact that they perceived the cause of the neurosis to lie in previous personality disorders in the patients, their recommendation of psychotherapy as the main method of treatment, and their emphasis on the need for further rehabilitation following the completion of the course of hospital treatment. They also paid significant attention to the importance of drawing up individual therapy plans for each patient.