Descriptions of situations immediately preceding the outbreak of a military conflict, specifically eve of military invasion are under consideration. Situation descriptions are treated as sets of relevant statements. The descriptions of various situations highlight similar claims. Descriptions containing identifiable statements form associations. Developments and situations observed and treated through descriptions that consist of statements. One form of similarity of situations or developments observed as descriptive similarity and its results through numerical evaluation. Based on of descriptive similarity, the eve of military invasion, involving states attack to another state, are investigated. The calculations made express the irrelevance of the corresponding descriptions from public available sources. Means provided to quantify the general similarity of descriptions of situations constituting an association. Such estimates provide a first insight into what and how similar situations may develop in the context of this association.