But now a new danger suggested itself. The Teutonic invasion was heading toward the Danube. Should it reach the banks of that river there would be nothing to prevent a juncture between the forces of Falkenhayn and those under Mackensen, thereby forming a net which would be stretched clear across Rumania and swept eastward toward Bucharest. Falkenhayn had only to clear the northern bank of the Danube, and nothing could prevent Mackensen's crossing; as was presently to develop, this fear was not without foundation. On the 24th came the announcement from Berlin that Falkenhayn had captured Turnu-Severin on the Danube and that Mackensen's troops had crossed in several places and effected a juncture with Falkenhayn's men. Farther north the Rumanians were reported to be falling back to positions along the Alt River, a swift, deep stream in its upper reaches which broadens out into many arms down on the plain and forms a difficult obstacle to an advancing army. At Slatina the bridge is over four hundred yards in length. This, apparently, was to be the new line of defense, running north and south. Still farther north, in the Carpathians, in Moldavia, the Austro-Germans were developing another strong offensive, and here, near Tulghes Pass, where the Russians held the line, a pitched battle of unusual fury developed, bringing the Austro-Germans to a standstill for the time being, at least. Again there came reports from Petrograd of activity along the front in Dobrudja, but this appears to have been at the most nothing but a demonstration to distract Mackensen from effecting any crossing farther up the Danube at a point where he might flank the Rumanian lines along the Alt. Throughout the countries of the Allies it was now generally recognized that Rumania was doomed, unless the Russians could send enough forces to rescue her.