At this time the LIV Army Corps of the 11th Army were still engaged in the Crimea, and because the Romanian forces were still engaged in the Siege of Odessa, the Army's resources for the Rostov objective were severely limited, even though Red Army troops were in retreat. For this reason Von Manstein initially replaced the LIV Corps with the smaller XXX Army Corps and XLIX Mountain Corps and ordered the LIV Corps into the first echelon in the advance to Rostov.