One of the heaviest battles of this period took place on September 6, 1915, lasting into the early morning hours of the 7th, along a front about twenty-five miles wide, with its center about at Radziviloff, a little town just across the border of the Lemberg-Rovno railroad, a few miles northeast of Brody. There the Russians had strongly intrenched themselves. The fighting was most bitter, especially around the castle of Podkamen, which Boehm-Ermolli's troops wrested from the Russians only through repeated and most fierce infantry attacks and by means of terribly bloody hand-to-hand fighting. However, finally the Russians had to give way, leaving over 3,000 men in the hands of their adversaries. Farther south the armies of Generals von Bothmer and Pflanzer-Baltin, too, had to withstand continuous attacks of the Russians and more or less fighting went on all along the southeastern front as far down as Nova-Sielnitsa, a few miles southeast of Czernovitz at the point where the borders of Rumania, Galicia, and Bessarabia meet. The result of the Austrian victory of September 7, 1915, near Radziviloff was the further withdrawal on September 8, 1915, of the Russian line, extending over fifty-five miles to the east bank of the Ikwa River, a tributary of the Styr, on the west about thirty miles northeast of Radziviloff on the Lemberg-Rovno railroad. This withdrawal, of course, seriously threatened this fortress, which, being on the west side of the Ikwa, was open to direct attack from the west and south as soon as the Russians had been thrown back beyond the Ikwa. And, indeed, the next day, September 9, 1915, brought the fall of the city and fortress of Dubno. Austrian troops under General Boehm-Ermolli took it by storm, while other detachments advanced to the Upper Ikwa and beyond the town of Novo Alexinez. This was as serious a loss to the Russians as it was a great gain for their enemies. For Dubno commanded not only the valley of the Ikwa, but it also blocked the very important railway and road that run from Lemberg to Rovno.