The reception of the ideology of the 13th–14th c. Crusades on the Eastern coast of the Baltic Sea, the ideological imperatives of the Holy War, and their reflections in the Chronicle of Peter of Dusburg, one of the most famous chroniclers of the conquest of the Baltic tribes, are analyzed in the article. Even though lately the said Chronicle has been paid great attention to in foreign historiography, in Lithuanian historiography the rhetoric of the Holy War, related to the particular example of the Battle of Durbė, has not been analyzed so far. Moreover, the assessment of the spread of Christian missions in the contexts of the battle of Durbė, as well as its activeness, dynamics, and the relation to the Crusades, have not been analyzed, either.