The article considers Jean-Paul Sartre’s criticism of stoicism as military philosophy. The study is based on the analysis of the philosopher’s diary notes taken in “The Phony War” of 1939-1940. According to Sartre, accepting the stoic doctrine in the war is a trick to get away from reality. The war annihilates the stoic perception of the world as “things we can control and things we can’t” being an important dimension of human existence. Sartre’s criticism is relevant since the problem of applying certain aspects of stoicism in the sphere of military moral and as a therapeutic means for rehabilitation of war veterans is topical nowadays.