Supporting materials on Polish history for graduates have been examined from the statistic side. Counting was not the individual parts of speech, but the word-forming bases of autosemantic words. In the material studied, relatively high frequency of concepts connected with the phenomenon of war was observed. Common concepts are war, fighting, army. On the other hand, related to the notion of war, rare words form long lists in the layer of hapax legomena. It allows to interpret some historical narrations intended for high school students as focused on the phenomenon of war.