Which city is called "South Westerplatte" because of its heroic defence during the opening stages of the Invasion of Poland in 1939?

The Battle of Węgierska Górka was a two-day-long defence of a Polish fortified area in south of Silesia. Although the Polish position was not completed and only five bunkers were manned, the line was defended for two days and nights against superior German forces. Eventually, the Germans managed to break through the Polish positions, but with heavy casualties on their side and with a significant delay.