Chełmno extermination camp
During Operation Tannenberg patients from Polish hospitals were murdered in "Wartheland" (Wielkopolska) by "Einsatzgruppe" VI under Herbert Lange. He was appointed commandant of the first Chełmno extermination camp soon thereafter. By mid-1940, Lange and his men were responsible for the murder of about 1,100 patients in Owińska, 2,750 patients at Kościan, 1,558 patients and 300 Poles at Działdowo who were shot in the back of the neck; and hundreds of Poles at Fort VII where the mobile gas-chamber ("Einsatzwagen") was first developed along with the first gassing bunker.