Polish army order of battle in 1939
|This article does not cite any references or sources. (December 2009)|
Polish OOB during the Invasion of Poland. In the late thirties Polish headquarters prepared "Plan Zachód" (Plan "West), a plan of mobilization of Polish Army in case of war with Germany. Earlier, the Poles did not regard the Germans as their main threat, priority was given to threat from the Soviets (see: Plan East).
The overall operational plan assumed the creation of 30 infantry divisions, 9 reserve divisions, 11 cavalry brigades, two motorized brigades, 3 mountain brigades and a number of smaller units. Most Polish forces were grouped into 6 armies and a number of corps-sized "Operational Groups". Later in the course of the war other operational units were created.
Karpaty Army 
Created on July 11, 1939 under Major General Kazimierz Fabrycy. Armia Karpaty was created after Germany annexed Czechoslovakia and created a puppet state of Slovakia. The main aim of the army was to secure mountain passes in the Carpathians. Initially the army consisted of 2 improvised mountain brigades and a number of smaller units, but later in the course of war was joined by forces of the withdrawing Armia Kraków.
- 2nd Mountain Brigade (2 Brygada Górska), made of National Defence units from Limanowa, Gorlice and Nowy Sącz, as well as Border Defence Corps units from Volhynia,
- 3rd Mountain Brigade (3 Brygada Górska), made of National Defence units from Krosno, Sanok, Przemyśl and Rzeszów
- Carpathian Half-Brigade of National Defence (Karpacka Półbrygada ON)
- 2nd Regiment of the Border Defence Corps, made of regiments of the Border Defence Corps from the area of Wilno,
- 1st Motorized Artillery Regiment
- 9th Heavy Artillery Regiment
Additionally, mobilisation plans called for creation of the Tarnów Group consisting of:
- 22nd Mountain Infantry Division from Przemyśl,
- 38th Infantry Division (reserve), created in August 1939 out of Border Defence Corps units from Polesie Voivodeship and Volhynian Voivodeship.
Kraków Army 
Created on March 23, 1939 as the main pivot of Polish defence. Its main task was to delay advancing German troops and withdraw eastwards along the northern line of the Carpathians. It consisted of 5 infantry divisions, 1 mountain brigade, 1 motorized cavalry brigade, 1 mountain brigade and 1 cavalry brigade under gen. Antoni Szylling.
Lublin Army 
Łódź Army 
Created on March 23, 1939 under gen. Juliusz Rómmel. Armia Łódź was to become a bolt between Armies "Kraków" and "Poznań". However, because of mistakes committed by Gen. Rómmel, the army was located too close to the German border and joined fighting from the very beginning of the campaign, which deprived it of any possibilities of cooperation with the surrounding units. It consisted of 4 infantry divisions and 2 cavalry brigades.
- 2nd Legions Infantry Division (2 Dywizja Piechoty Legionów) from Kielce,
- 10th Infantry Division (10 Dywizja Piechoty) from Łódź,
- 28th Infantry Division (28 Dywizja Piechoty) from Łomża,
- 30th Infantry Division (30 Dywizja Piechoty, reserve division) from Kobryn,
- Kresowa Cavalry Brigade (Kresowa Brygada Kawalerii) from Brody,
- Wołyńska Cavalry Brigade (Wołyńska Brygada Kawalerii) from Rowne,
- Sieradz National Defence Brigade (Sieradzka Brygada Obrony Narodowej)
Modlin Army 
Created on March 23, 1939 for defence of Warsaw from the north. The army was to defend fortified lines along the border with East Prussia near Mława, and then retreat towards Narew river. Led by brig. gen. Emil Krukowicz-Przedrzymirski. Consisted of 2 infantry divisions and 2 cavalry brigades.
- 8th Infantry Division (8 Dywizja Piechoty) from Modlin,
- 20th Infantry Division (20 Dywizja Piechoty) from Baranowicze,
- Nowogródzka Cavalry Brigade (Nowogródzka Brygada Kawalerii) from Baranowicze,
- Mazowiecka Cavalry Brigade (Mazowiecka Brygada Kawalerii) from Warsaw,
- Warsaw National Defence Brigade (Warszawska Brygada Obrony Narodowej)
Pomorze Army 
The Army was created on March 23, 1939 to defend Toruń and Bydgoszcz and to carry out delaying actions in the so-called "Polish Corridor". It was led by Lt.-Gen. Władysław Bortnowski and consisted of five infantry divisions, two National Defence brigades and one cavalry brigade.
|Pomorze Army||Unit||Polish name||Commander||Remarks|
|Army units - gen. Władysław Bortnowski|
|9th Infantry Division from Siedlce||9 Dywizja Piechoty||płk. Józef Werobej|
|15th Infantry Division from Bydgoszcz||15 Dywizja Piechoty||gen. Wacław Przyjałkowski||Greater Polish|
|27th Infantry Division from Kowel||27 Dywizja Piechoty||gen.bryg. Juliusz Drapella|
|Pomeranian National Defence Brigade||Pomorska Brygada Obrony Narodowej|
|Chełm National Defence Brigade||Chełmska Brygada Obrony Narodowej|
|Operational Group "East" - gen. Mikołaj Bołtuć|
|4th Infantry Division from Toruń||4 Dywizja Piechoty||płk. Rawicz-Mysłowski, płk. Józef Werobej|
|16th Infantry Division from Grudziądz||16 Dywizja Piechoty||płk. Zygmunt Szyszko-Bohusz||Pomeranian|
|Czersk Operational Group - gen.bryg. Stanisław Grzmot-Skotnicki|
|Pomeranian Cavalry Brigade from Bydgoszcz||Pomorska Brygada Kawalerii||gen.bryg. Stanisław Grzmot-Skotnicki|
|Independent Units Chojnice and Kościerzyna||Oddziały Wydzielone "Chojnice" i "Kościerzyna"|
Poznań Army 
The Armia Poznań led by mj. gen. Tadeusz Kutrzeba was to provide flanking operations in the Grand Poland and withdraw towards lines of defence along the Warta river. It consisted of 4 infantry divisions and 2 cavalry brigades.
- 14th Infantry Division (14 Dywizja Piechoty) from Poznań
- 17th Infantry Division (17 Dywizja Piechoty) from Gniezno
- 25th Infantry Division (25 Dywizja Piechoty) from Kalisz
- 26th Infantry Division (26 Dywizja Piechoty) from Skierniewice
- Wielkopolska Cavalry Brigade (Wielkopolska Brygada Kawalerii) from Poznań,
- Podolska Cavalry Brigade (Podolska Brygada Kawalerii) from Stanisławów.
Prusy Army 
Under gen. Stefan Dąb-Biernacki. Created in the summer of 1939 as the main reserve of the Commander in Chief. 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 "Poznań" and "Kraków".
Mobilized in two groups. Because of fast German advance both groups entered combat separately and most units did not reach full mobilization. It consisted of 6 infantry divisions, 1 cavalry brigade and a battalion of tanks.
Warszawa Army 
- For a detailed description of the Warszawa Army operations see: Siege of Warsaw (1939)
Created on September 10, 1939 from various units in Warsaw and Modlin Fortress area. Initially it consisted of approximately 25 infantry battalions and 40 tanks. Later it was reinforced by forces of Łódź Army and elements of Modlin Army. It was commanded by col. Walerian Czuma, although the nominal commander was gen. Juliusz Rómmel.
Operational Groups 
Operational Group Wyszków 
Was one of the reserves of the northern front of Polish defences. It consisted of 3 infantry divisions:
- 1st Legions Infantry Division (Poland) (1 Dywizja Piechoty Legionów) from Wilno,
- 35th Infantry Division (35 Dywizja Piechoty - reserve), formed on September 7, 1939, out of units of the Border Defence Corps from northern parts of the Wilno Voivodeship,
- 41st Infantry Division (41 Dywizja Piechoty - reserve), formed in September 1939, out of units of the Border Defence Corps.
Independent Operational Group Narew 
Consisted of 2 infantry divisions and 2 cavalry brigades:
- 18th Infantry Division (Polish: 18 Dywizja Piechoty) from Łomża,
- 33rd Infantry Division (Polish: 33 Dywizja Piechoty - reserve), formed in late August 1939, out of Border Defence Corps units from the areas of Grodno and Wilno,
- Podlaska Cavalry Brigade (Polish: Podlaska Brygada Kawalerii) from Białystok,
- Suwalska Cavalry Brigade (Polish: Suwalska Brygada Kawalerii) from Suwałki and Grodno.
Independent Operational Group Polesie 
Supporting forces 
- Lotnictwo Wojskowe (Polish Air Force)
Naval and river support
- Polska Marynarka Wojenna (Polish Navy)