 Complete the following phrase:  During the German invasion of Poland, which started World War II, on September 9, 1939, Łańcut was a place of fierce defense by Poles under the command of Colonel Stanisław Maczek, who would become one of the Polish heroes of World War II. During the subsequent German occupation, the Einsatzgruppe I entered the town between September 17 and October 5, 1939 to commit various 