 Complete the following phrase:  After the invasion of Poland, Poznań was annexed by Germany and the University was closed by the Nazis in 1939. It was reopened as a German university in 1941, which operated until 1944. Staff and students of the Polish university, some of them expelled by Germans to Warsaw, opened an underground Polish University of the Western Lands Polish: Uniwersytet Ziem Zachodnich, whose classes met in private apartments see Education in Poland during World War II. Many of the professors and staff were imprisoned and executed in 