The second stage of the 1st Ukrainian Front's objective was far more complex, as they were required to encircle and secure the entire industrial region of Upper Silesia, where they were faced by Schulz's 17th Army. Konev ordered that the 59th and 60th Armies advance frontally, while the 21st Army encircled the area from the north. He then ordered Rybalko's 3rd Guards Tank Army, moving on Breslau, to swing southwards along the upper Oder from 20 January, cutting off 17th Army's withdrawal.