Polish army order of battle in 1939

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.

Additionally, mobilisation plans called for creation of the Tarnów Group consisting of: Created on March 23, 1939, as the main pivot of Polish defence.

An improvised army created on September 4 from a motorized brigade and various smaller units concentrated around Lublin, Sandomierz and upper Vistula.

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.

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".

gen. Tadeusz Kutrzeba was to provide flanking operations in the Grand Poland and withdraw towards lines of defence along the Warta river.

According to Plan West, it was supposed to defend the line of the Narew river from Wehrmacht units advancing from East Prussia.

Due to rapid German advance, the group withdrew towards the Bug river, and on September 11, Polish Commander in Chief Edward Rydz-Śmigły ordered General Wincenty Kowalski, commandant of Operational Group Wyszków, to merge his unit with Northern Front under General Stefan Dąb-Biernacki.