The Soviet forces took heavy casualties while penetrating 30–60 km (19–37 mi) into east-northern part of Poland, and the offensive was postponed until greater reserves could be gathered.

[8] From the north, on Chernyakhovsky's right flank, General Hovhannes Bagramyan's 1st Baltic Front would attack the positions of the 3rd Panzer Army on the Neman, as well as crushing its small bridgehead at Memel.

Chernyakhovsky's left flank would be supported by the 2nd Belorussian Front of Marshal Konstantin Rokossovsky, which was initially ordered to push north-west to the Vistula, through the lines of the 2nd Army, thereby sealing off the whole of East Prussia.

Eventually, after almost two weeks of severe fighting, the Red Army began making steady progress, although again, this came at the price of high losses; the defenders having the advantage of substantial fortifications in the Insterburg Gap east of Königsberg, and around Heilsberg.

On the same day, Hossbach began to pull his units back from the fortified town of Lötzen—a center of the East Prussian defence system—and through a series of forced marches attempted to break out westward.