Ozerov transferred to serve as chief of staff of the 50th Army of the 2nd Belorussian Front in September 1944, distinguishing himself in the preparation of the East Prussian offensive to eliminate the German forces in East Prussia. He took command of the army on 2 February 1945 when army commander Colonel General Ivan Boldin was relieved. The army became part of the 3rd Belorussian Front on 11 February, and on 17 February captured Wormditt, then from 6 to 9 April fought in the storming of the city during the Battle of Königsberg. For his planning of the East Prussian Offensive, Ozerov received the Order of Suvorov, 1st class. He simultaneously served as chief of the Königsberg garrison from April 1945.