Łódź Army

Commanded by Juliusz Rómmel, it consisted of five infantry divisions and two cavalry brigades with support from the air force.

The army's task was to fill the gap between Army Poznań in the north (defending Greater Poland under general Tadeusz Kutrzeba) and Army Kraków in the south (operating in Silesia and Lesser Poland under general Antoni Szylling), prevent enemy attacks in the direction of Łódź and Piotrków Trybunalski and if possible, advance towards Sieradz.

Because of that, the main strategic purpose of the army was to gain time and offer delaying actions and harsh resistance on the expected main German offensive line (Częstochowa-Łódź-Warsaw)in order for the mobilization to be accomplished.

By the beginning of the second week of fighting, Army Łódź had suffered heavy casualties and failed to carry out its task of defending its part of the Polish borders.

Piotrków Group, or as it became known after its commander, Thommée's Group, was much more successful, managing to avoid encirclement, and after the Battle of Wola Cyrusowa (September 8) his corps' last battle was the defence of the Modlin fortress (capitulated on 29 September).

Monument to Łódź Army in Park Helenów in Łódź
Forces as of 31 August and German plan of attack.
Forces as of 14 September with troop movements up to this date.
Forces after 14 September with troop movements after this date