Again occupied in the 1939 invasion of Poland by Nazi Germany during World War II (and renamed Loben, 1941–45). During the German occupation, the Polish population was subjected to mass arrests, imprisonment, deportations to Nazi concentration camps and executions. On September 8, 1939, the "Einsatzgruppe II" entered the town to commit various crimes against Poles. 180 civilian defenders were murdered immediately by the invading Germans in September 1939, in accordance with Adolf Hitler's orders to execute Polish "partisans" immediately. Soon after capturing the city, the Germans took over the local psychiatric hospital, and several hundred children were murdered there during the occupation as part of the "Aktion T4". There were also cases in which the killed children's brains were used for medical research by the Germans in Wrocław, as mentioned by German doctor Elisabeth Hecker, who was in charge of the hospital since 1941. The Germans also established and operated a Nazi prison in the town, and the E609 forced labour subcamp of the &lt;a href="Stalag%20VIII-B"&gt;Stalag VIII-B/344&lt;/a&gt; prisoner-of-war camp in the present-day district of Kokotek. Teachers from Lubliniec were among Polish teachers imprisoned and murdered in concentration camps. The area was conquered by the Red Army in January 1945 in the course of the Vistula–Oder Offensive, and then restored to Poland.