The Crimean War should be considered the catalyst for building the first fortification of Przemyśl. Russian expansion in the Balkans presented a threat to Austrian plans in this region. Despite this, Austria kept enemy neutrality. Although Habsburg Monarchy didn't support any side of conflict, they didn't let Russian armies to pass by their territory. The temporary breach of international realations and the threat of war began bulding earhworks which surrounded Przemyśl.