Game covers several battles of the "Polish" part of the Great Northern War, a major conflict fought at the beginning of XVII century, when Saxony, Russia and Dennmark attacked Sweden. Thanks to the leadership skills of the Carolux XII, Swedish army won several battles during this war. "Kalisz 1705" allows to recreate couple of battles of this war - small scale skirmish at Tylewice 1704, medium battle - Poniec 1704 and two major battles - Wschowa (Fraustadt) 1706 and Kalisz 1706. Game uses Husaria system rules, slightly modiefied for the more infantry based battles than usually in this system.