Gains OnNaziFrontsNew German troops now pressing closer on StalingradMOSCOW. Auk. 19 lt;INSi-Hpav-ily reenforced Cfermnn armies were driven closer to Stalingrad, a So-Viet communique admitted today. They also made gains on the southern front.Following an early rejxirt of Nazi retreats on the IXiii front, fresh troops thrown into the battle by Nazi Field Marshal Fedor Von Hock, forced the H(*d armv to with-4draw on the sector around Kiets-kaya, 70 miles northwest of Stalingrad.In the Kotelnikovo area, on the southern prong, the pinchers closing in on the vital industrial town, the enemy wrested the offensive from the Russians, the communique admittKl.Oerman gains were scored also in tile southern zone of the battle areas in a drive on Piati^orsk. 23 miles southwest of Cherkessk. Thnujghout the Caucasus and DonRiver fronts tlie hard-pressediorces of Marshal Semyon Timoshenko were on the defensive and retrt*ated.Hut on the l/'uingrad front the Soviet launcluHl new heavy olten.s-ives and forced tiie Nazis back in attack conducted by tierce artillery barrages.