The farther Mackensen advanced northward the more men he would require to guard his rear along the river. For the time being, at least, the river created a deadlock, with the advantage to whichever side should be on the defensive. The Rumanians might very well now have left a minimum force guarding the river bank while they turned their main forces northward to stem the tide of Teuton invasion through the passes. For over a week this seemed exactly what the Rumanians were doing. On November 4, 1916, the situation along the Rumanian front in the mountains looked extremely well for King Ferdinand's armies. At no point had the Teutons made any appreciable headway, while in two regions, in the Jiul Valley and southeast of Kronstadt, Bucharest reported substantial gains. Berlin and Vienna both admitted that the Rumanians had recaptured Rosca, a frontier height east of the Predeal Pass. CHAPTER XXIX MACKENSEN PRESSED BACK On November 6, 1916, came the news from Bucharest that the Rumanian and Russian forces in northern Dobrudja had again assumed the offensive and that Mackensen's line was giving way; and that in retiring his troops had burned the villages of Daeni, Gariot, Rosman, and Gaidar. Full details of these operations were never issued, but as day after day passed it became obvious that the Russo-Rumanian armies were indeed making a determined effort to regain the ground lost in Dobrudja. On November 9, 1916, it was announced through London that the Russian General Sakharov had been transferred from Galicia and was now in command of the allied forces in Dobrudja; that he had succeeded in pushing Mackensen's lines back from Hirsova on the Danube, where a gunboat flotilla was cooperating with him, and that Mackensen was now retreating through Topal, twelve miles farther south, and was only thirteen miles north of the Cernavoda-Constanza railroad. On November 10, 1916, an official announcement from Petrograd stated that "on the Danube front our cavalry and infantry detachments occupied the station of Dunareav, three versts from Cernavoda. We are fighting for possession of the Cernavoda Bridge. More than two hundred corpses have been counted on the captured ground. A number of prisoners and machine guns have also been captured. We have occupied the town of Hirsova and the village of Musluj and the heights three versts south of Delgeruiv and five versts southwest of Fasmidja." On the following day the Russian ships began bombarding Constanza and set fire to the town which, according to the Petrograd reports, was burned to the ground. At the same time a Russian force advancing southward along the right bank of the Danube occupied the villages of Ghisdarechti and Topal. On that same date Sofia also reported heavy fighting and an enemy advance near the Cernavoda Bridge. Two days later, on the 13th, an indirect report through London stated that the Russians had crossed the Danube south of the bridge, behind Mackensen's front.