Scherbachev was less successful against Bothmer in front of Tarnopol; but his left wing carried Buczacz, farther south, and crossed the Strypa, while beyond the Dniester Lechitsky outdid Kaledin's success at Lutsk. Forcing the passage of the Dniester near Okna on that same 4th of June, he broke the Austrian front and drove one half of it west to Horodenka and the other half south-east towards Czernowitz. The latter portion was now an isolated and disorganized fragment of the Austrian army which could do nothing but escape across the Pruth and the Carpathians leaving Lechitsky to overrun the Bukovina. On the 17th the Russians entered Czernowitz, its capital, and six days later they reached Kimpolung, its most southerly town. Other columns swept west to Sniatyn and Kuty, and by the 23rd the whole of the province had been conquered. The Austrians were in no position to impose a pause upon the frontier of Galicia, and Kolomea fell on the 29th. Tlumacz followed on the 30th and Bothmer's right was seriously threatened. Gathering some German reinforcements he counter-attacked on 2 July, recovered Tlumacz, and checked Lechitsky's right, though his left continued its advance along the Carpathian foothills and captured Delatyn on 8 July, thus cutting the railway to Marmaros Sziget. The Dniester and the Pruth were now flooded with July rains, and a month elapsed before Lechitsky could resume his march. Other causes had checked the Russians farther north. Brussilov's offensive may have been merely a vast reconnaissance in force, but its astonishing success had stirred the Germans to prompt action. Ewarts was beginning an attack on the important junction of Baranovitchi north of the Pripet marshes, and presently the line of battle spread down the Shchara and along the Oginski canal. If he succeeded like Brussilov, Brest-Litovsk might be caught between two fires with dire results to the whole German front in Russia and future in the Balkans. It was a peril to which the German prospects at Verdun and forebodings on the Somme were secondary considerations; and both the Western allies profited from Brussilov's campaign. One German corps was hurried from Verdun to Kovel in six days, and others followed at a less exhausting speed. Austrians also came from the Tyrol and the Balkans, and Ludendorff was sent to restore confidence in the command. Kovel was the southern key to Brest-Litovsk; the northern flank could look after itself since Ewarts was making little progress, and Bothmer had barred the way for the time to the other essential points at Lemberg and Stanislau. But Kovel was in serious danger, for the Russians had penetrated to Lokatchi due south of that fortress; and it was for its defence that Ludendorff organized the Austrian counter-offensive in the latter half of June.