http://www.onwar.com/chrono/1943/feb1943/f06feb43.htm
Red Army forces cross the Donets River
Saturday, February 6, 1943 www.onwar.com
Soviet tanks carry infantry into battle [photo at link]
On the Eastern Front... In the Caucasus the Soviets reach Bataysk, south of Rostov, and capture Yeysk on the Sea of Azov. On the Donets River, Lisichansk is occupied and Red Army forces cross the river further upstream at Izyum, reaching Barvenkovo.
From Washington... The American command in Europe and North Africa is restructured. General Andrews is appointed to the new European Theater Command and General Eisenhower remains in command in North Africa.
In Berlin... Manstein, commanding Army Group Don on the Eastern Front, flies to see Hitler about getting approval for a retreat behind the Mius River.