 Complete the following phrase:  During the joint German-Soviet invasion of Poland, which started World War II in September 1939, the Luftwaffe twice bombed Modliborzyce September 8 and 15. As a result, 87 people died and most of the buildings in the town were destroyed. The local wójt head of the gmina Karol Potocki was murdered by the Germans during large massacres of Poles committed in 1940 in Rury, Lublin as part pf the 