Excerpts from Books and Wikipedia
"The campaign was a strategic Soviet success. For the first time, a major German offensive had been stopped before achieving a breakthrough; the maximum depth of the German advance was 8–12 kilometres (5.0–7.5 mi) in the north and 35 kilometres (22 mi) in the south. The Germans, despite using more technologically advanced armour than in previous years, were unable to break through the deep Soviet defences and were caught off guard by the significant operational reserves of the Red Army. This result changed the pattern of operations on the Eastern Front, with the Soviet Union gaining the operational initiative. The Soviet victory was costly, with the Red Army losing considerably more men and materiel than the German Army. The Soviet Union's larger industrial potential and pool of manpower allowed them to absorb and replace its losses." [Wikipedia]