Following a 30-minute artillery barrage, the 7th Guards Army and the 6th Guards Tank Army led an attack to the northwest, opening the offensive of the 2nd Ukrainian Front. Adding to the difficulties of the defending German 8th Army, the Soviet 9th Guards Army and 46th Army reinforced the attack on its left (southern) wing. By the end of the day, the front had pushed 12 kilometers into the German lines along an advance 25 kilometers in breadth. Between the 2nd and 1st Ukrainian Fronts, the 4th Ukrainian Front continued its advance on Olomouc.