Nasielsk returned to Poland, as the country regained independence. During the Polish-Soviet War, in August 1920, Polish forces won the Battle of Nasielsk against the advancing Red Army. In 1924, the town became a rail junction after completion of a line to Toruń. Following the joint German-Soviet invasion of Poland, which started World War II in September 1939, the town was occupied by Germany until 1945, and the population was subjected to repressions. In December 1939, the Jews of Nasielsk were expelled to other towns and cities where they fell victim to various atrocities and the Holocaust. In April 1940, the Germans arrested the pre-war Polish mayor Feliks Rostkowski, and imprisoned him in a concentration camp; however, he survived and returned to Nasielsk after the war. In December 1940, the Germans expelled around 1,000 Poles from the town. Expelled Poles were held in a camp in Działdowo for two weeks, where they were stripped of valuables, and then deported in freight trains to the Radom District of the General Government, while their houses and workshops were handed over to German colonists as part of the Lebensraum policy. From 1941 to 1943, the Germans operated a forced labour camp in the town. The first official inventory of important buildings in Poland, A General View of the Nature of Ancient Monuments in the Kingdom of Poland, led by Kazimierz Stronczynski from 1844–55, describes the Nasielsk Synagogue as one of Poland's architecturally notable buildings. In 2009, Glenn Kurtz stumbled upon a home video shot by his family that included three minutes of footage in Nasielsk shot in 1938. Kurtz set out to restore the film and find the people in it. The book based on this journey is titled Three Minutes in Poland: Discovering a Lost World in a 1938 Family Film. In 2022, Bianca Stigter’s debut documentary Three Minutes: A Lengthening based on the book was released. It includes the three minute restored footage, with narration by Helena Bonham Carter. Sports The local football club is Żbik Nasielsk, with both men and women teams. Both teams compete in the lower leagues. Cuisine The officially protected traditional food produced in Nasielsk is local cold pressed linseed oil (as designated by the Ministry of Agriculture and Rural Development of Poland). The tradition of oil production in Nasielsk and its surroundings dates back hundreds of years. The oldest mention of an oil mill in the