Despite several Polish tactical victories (like in the battle of Mokra on 1 September), Polish forces were soon forced to retreat, as Army Łódź was being outflanked by the German Eighth Army and the German Tenth Army.
Meskipun beberapa kemenangan taktis Polandia (seperti dalam Pertempuran Mokra pada 1 September), pasukan Polandia terpaksa mundur, karena Angkatan Darat Łódź terkepung oleh Angkatan Darat Jerman ke-8 dan Angkatan Darat Jerman ke-10.