 Complete the following phrase:  After the Soviet Operation Uranus surrounded Axis forces in the city, the remaining groups took part in desperate counterattacks. Even medium bombers were used in close air support. With other units, KG 27 inflicted heavy losses to Soviet infantry and horses on 25 November in action along the Chir river. KG 27 assisted with the failed airlift but third group was sent to Hannover to rebuild and rest from December 1942 until 14 January 1943. The group returned to combat operations as Army Group South sought to prevent a total collapse of the front. II.KG 27 is known to have supported the 