In the following pages I wish to offer a reflection on the semantic and conceptual interrelations existing between four terms that Xenophon uses to express his views on warfare. On one side the couple θάρσος / θράσος, which conveys a nuanced concept varying between courage and recklessness. On the other, the couple of antonyms εὐταξία / ἀταξία, whose meaning Xenophon seems to develop into that of a self-discipline that stems from and reflects a well ordered state of the soul, and its opposite. The aim of this paper is to explore these new nuances and follow their emergence in Xenophon’s vocabulary.