From back cover:
The mighty Vistula River sets the stage for a journey from Krakow to the remains of Warsaw aboard the river tug Wisla Krolowa.
All the important forces along the river, such as the bandit and marauder units, and of course, the vicious river pirates ... are described in terms of organization, equipment, and motivations.
Provides complete rules for a new type of warfare in the world of Twilight: 2000 -- riverine combat.
Pirates of the Vistula gives a rich detailed look at the entire course of the upper Vistula and its environs.
Includes deck plans of the Wisla Krolowa and map of the Vistula.