V-1 flying bomb assembly began during October/November 1944 in the South end of tunnel A. At the end of January 1945, 51 V-1s were shipped from a dispersed Fieseler factory in Upper Bavaria (code name Cham) to the Nordhausen plant for completion. After a second V-1 factory at Burg was closed, the Mittelwerk "Werk II" in February 1945 was the only factory producing V-1 flying bombs, and a total of 2,275 V-1s were built by Werk II from September 1944 until April 1945.