 Complete the following phrase:  During World War II, Beynar was a soldier in the Polish Army, fighting the German Wehrmacht when it invaded Poland in September 1939. He commanded a platoon near Sandomierz and was eventually taken prisoner by the Germans. While in a temporary prisoner-of-war camp in Opatów, he was able to escape with the help of some old school friends from the time his family lived there in the early 1920s. He joined the Polish underground organization, Związek Walki Zbrojnej Association for Armed Combat, later transformed into the Armia Krajowa AK; the Home Army, and continued the fight against the Germans. In the resistance he had the rank of lieutet, worked in the local Wilno headquarters and was an editor of an underground newspaper Pobudka. He was also involved in the underground teaching. In July 1944 he took part in the operation aimed at the liberation of Wilno from the Germans 