Prusy Army

The Prusy Army (Polish: Armia Prusy) was one of the Polish armies to fight during the Invasion of Poland in 1939. Created in the summer of 1939 as the main reserve of the Commander in Chief, it was commanded by Gen. Stefan Dąb-Biernacki. The word Prusy in the Polish language means Prussia, but this name only served as a codename and the region of operations of this army was far from East Prussia. This is in contrast to other Polish armies in 1939 which were named after the geographical regions where they formed. The Prusy Army, whose original name was Warszawa Army, was named so after a folwark in central Poland called Prusy, which served as the headquarters of General Dąb-Biernacki.

According to the "Plan West" (Plan Zachód, code name for the Polish mobilization plan) it was to be composed of units mobilized as the second and third waves, and its main purpose was to cooperate with the nearby armies "Łódź" and "Kraków". It was being mobilized in two groups after the outbreak of hostilities. It consisted of 6 infantry divisions, 1 cavalry brigade and a battalion of tanks. Once ready, it was supposed to stop the main German thrust. The army, divided into two groups, northern and southern, was concentrated southwest of Warsaw (in the triangle between Kielce, Radom, and Tomaszów Mazowiecki), as Marshall Edward Śmigły-Rydz was convinced that main German thrust would be directed at Warsaw, via Łódź.

Northern group of Prusy Army was planned to be concentrated in the area Koluszki-Łowicz-Skierniewice, while its southern group was located in the area marked by the towns of Skarżysko-Kamienna-Opoczno-Radom. After detraining, the units of the Army were to take positions in the following towns: 44th I.D. - Sochaczew, 13th I.D - Regny, 19th I.D. - Tomaszów Mazowiecki, Wilno Cavalry Brigade - Piotrków Trybunalski, 29th I.D. - Sulejów, 36th I.D. - Opoczno, 12th I.D. - Końskie, 3rd I.D. - Skarżysko-Kamienna, 39th I.D. - Kozienice.

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