Sermons delivered and prayer books read in the Swedish Army during the ‘Age of Greatness’ reflect the Swedish expansion in the Baltic area during the 17th century, and the subsequent retreat in the early 18th century. These genres had a transnational character. The mobility and the international composition of the army strengthened the Reformatory heritage and put the army in contact with contemporary developments in continental Europe. The prayer books and the military sermons expressed a Lutheran world-view and self-understanding. This Lutheran identification was connected to the idea that the Swedes were God’s chosen people. Thus, preaching and prayer in the Swedish army was an expression of a particular Swedish confessional culture, existing within a greater early modern Lutheran confessional culture.