Passage: The surrounded Axis personnel comprised 265,000 Germans, Romanians, Italians, and the Croatians. In addition, the German 6th army included between 40,000 and 65,000 Hilfswillige (Hiwi), or "volunteer auxiliaries", a term used for personnel recruited amongst Soviet POWs and civilians from areas under occupation. Hiwi often proved to be reliable Axis personnel in rear areas and were used for supporting roles, but also served in some frontline units as their numbers had increased. German personnel in the pocket numbered about 210,000, according to strength breakdowns of the 20 field divisions (average size 9,000) and 100 battalion sized units of the Sixth Army on 19 November 1942. Inside the pocket (German: Kessel, literally "cauldron"), there were also around 10,000 Soviet civilians and several thousand Soviet soldiers the Germans had taken captive during the battle. Not all of the 6th Army was trapped: 50,000 soldiers were brushed aside outside the pocket. These belonged mostly to the other two divisions of the 6th Army between the Italian and Romanian Armies: the 62nd and 298th Infantry Divisions. Of the 210,000 Germans, 10,000 remained to fight on, 105,000 surrendered, 35,000 left by air and the remaining 60,000 died.

Question: What unit were these soldiers part of?
the 6th Army