In Udórz, a village north of Wolbrom (near the border of the provinces of Silesia and Lesser Poland), there is a monument to the soldiers of the battalion "Umbrella” of the Home Army, who perished July 11, 1944, during the retreat from Kraków, after a failed assassination attempt on Wilhelm Koppe, a higher commander of the SS and the Police in the General Government. Two soldiers were killed in action. Three wounded were murdered a few days later in Kraków, after a brutal interrogation.