The game simulates one of the biggest battles of the Polish Defensive War of 1939 that took place near the town of Piotrków Trybunalski from 5 to 6 September, 1939. After two-day fierce fighting, the Polish forces suffered a defeat and were forced to retreat. This is a new edition of the "Piotrków 1939" game that is based on the WB-95 wargaming system developed by Taktyka i Strategia. The previous editions of the game were based on different wargaming systems (e.g. W-39).