Russian divisions, keeping with Red Army practice, are smaller than NATO divisions. A full strength Russian division has around 12,000 men. 55,000 men would represent 4.5 Russian divisions. That would constitute an army under the Red Army.
Thanks.
I just finished reading “Marshall and His Generals” (US Army Commanders of World War II) by Stephen R. Taaffe. Excellent book for those interested in WW II.