 Complete the following phrase:  On 15 November 1942, the Auxiliary Staffel was created. By mid-1943, Luftflotte 1 was given four Staffeln while Luftflotte 4 and Luftwaffe Kommando Ost Luftwaffe Command East were given six and two respectively. In the first half of 1943, 12 Nachtschlachtgruppen night battle groupsNSGr had been formed, flying a multitude of different types of aircraft, including the Ju 87, which proved itself ideally suited to the low-level slow flying needed. NSGr 1 and 2 fought with some success on the Western Front during the Battle of Normandy and Battle of the Bulge. NSGr 7 operated in anti-partisan role from bases in Albania from July 1944, replacing their use of German trainers. The 3rd and 4th group served on the Eastern Front, the 8th in the Arctic and the 9th in Italy. NSGr 20 fought against the Western Allied invasion of Germany in 1945. Photographic evidence exists of 16 NSGr 20 Ju 87s lining up to take-off in the woods circling the Lippe airfield, Germany while under attack from Republic P-47 Thunderbolts of the USAAF IX Tactical Air Command. The unit operated against the Ludendorff Bridge during the 