Stalag XX-B was a German prisoner-of-war camp in World War II, operated in Wielbark (present-day district of Malbork, Poland).

[3] The first prisoners of Stalag XX-B were Polish troops captured during the German invasion of Poland, which started World War II in September 1939.

[1] In July 1940, Stalag XX-B still lacked basic infrastructure and had only overcrowded tents and dugouts for the POWs and a few barracks for the guards, all surrounded by barbed wire and watchtowers.

[7] The Polish resistance secretly organized transports of POWs who escaped the camp to the port city of Gdynia, from where they were further evacuated by sea to neutral Sweden.

[10] The march lasted three and a half months, during which the POWs struggled with cold, hunger, exhaustion, diseases, etc., and were even subjected to forced labor to clear cluttered roads and railroads after Allied bombings.