 Complete the following phrase:  After a few days the Battle of the Border was lost, and forces of German Army Group South advanced deep into Lesser Polands territory. Polish troops resisted fiercely, and among major battles in initial stages of the war, which took place in Lesser Poland, there are Battle of Mokra, Battle of Jordanów, and Battle of Węgierska Górka. By 6 September, Polish forces were in general retreat and Marshal of Poland Edward Rydz-Śmigły ordered all troops to fall back to the secondary lines of defences at the Vistula and San Rivers. German units entered Częstochowa on 3 September where on the next day they murdered hundreds of civilians, Kielce on 5 September, Kraków on 6 September, and Radom on 8 September see also Battle of Radom. Within a week, almost whole Lesser Poland was under Nazi occupation. Northeastern part of the province, the area of Lublin, was held by the Poles until 17 September, but eventually, and after fierce battles see 