Back to War is the second expansion pack, and it can be played as a standalone. Cossacks: Back to War adds two new nations (Switzerland and Hungary) to the choices from Cossacks: European Wars and Cossacks: Art of War because of their influence on European history. There are also new maps, a tutorial campaign and a map-editor. It adds several units to various countries, new cannon types and alters some parameters such as building time, upgrade and building costs.