Battle of Stalingrad Air Army from the north as part of the Don Front offensive and 1st Guards Army, 5th Tank, 21st Army, 2nd Air Army and 17th Air Army from the south as part of the Southwestern Front. The calculation of casualties depends on what scope is given to the Battle of Stalingrad. The scope can vary from the fighting in the city and suburbs to the inclusion of almost all fighting on the southern wing of the Soviet–German front from the spring of 1942 to the end of the fighting in the city in the winter of 1943. Scholars have produced
Battle of Stalingrad later by General Maximilian von Weichs. The start of "Case Blue" had been planned for late May 1942. A number of German and Romanian units that were to take part in "Blau", however, were besieging Sevastopol on the Crimean Peninsula. Delays in ending the siege pushed back the start date for "Blau" several times, and the city did not fall until the end of June. Operation Fridericus I by the Germans against the "Isium bulge", pinched off the Soviet salient in the Second Battle of Kharkov, and resulted in the envelopment of a large Soviet force between 17 May and