In the south and southwest, the German Army Group South under Gerd von Rundstedt struck along the lines dividing the Polish Army Łódź (under Juliusz Rómmel) from Army Poznań (north) and Army Kraków (south, under Antoni Szylling). Despite several Polish tactical victories (such as 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. Army Kraków was retreating from Silesia, and, in the south, Army Karpaty under Kazimierz Fabrycy was being slowly pushed north towards the Dunajec and Nida Rivers by the German Fourteenth Army.