 Complete the following phrase:  Ivan Chernyakhovsky, commander of the 3rd Belorussian Front, set the tactical task to 39 Army that put it into operation on the second day of attack in the direction of Kudirkos Naumiestis, Pilkallen, Hensnishkenen. The 39 army started their advance on 17 October, encountered opposition, and carried only in a week. The offensive was postponed what is sometimes called the First East Prussian Offensive or the 