"Another interesting point about their advance is the fact that the Russians practically in no place used guns of the heaviest caliber, and that the preliminary artillery fire in no place lasted above thirty hours, and in many places not more than twelve hours. "Last summer's experience is not forgotten by the Russians and there has probably been the most economic use of ammunition on any of the fronts in this war commensurate with the results during these advances. Rarely was a hurricane fire directed on any positions preceding an assault, but the artillery checked each shell and its target, which was rendered possible by the nearness of our front lines. "In this way avenues were cut through the barbed wire at frequent intervals along the line through which the attacks were pressed home and the flanking trenches and the labyrinths were taken in the rear or on the flanks before the Austrians were able to effect their escape. The line once broken was moved steadily forward, taking Lutsk six days after the first attack, and one division reaching its maximum advance of forty-eight miles just ten days after the first offensive movement." CHAPTER XXIV PROGRESS OF THE BUKOWINIAN CONQUEST On June 21, 1916, the Russians gained another important victory by the capture of the city of Radautz, in the southern Bukowina, eleven miles southwest of the Sereth River, and less than ten miles west of the Rumanian frontier. This river Sereth must not be confused with a river of the same name further to the north in Galicia. The latter is a tributary of the Dniester, while the Bukowinian Sereth is a tributary of the Danube, which latter it joins near the city of Galatz, in Rumania, after flowing in a southeasterly direction through this country for almost two hundred miles. The fall of Radautz was an important success for various reasons. In the first place, it brought the Russian advance that much nearer to the Carpathian Mountains. In the second place, it gave the invading armies full control of an important railway running in a northwesterly direction through the Bukowina. This railway was of special importance, because it is the northern continuation of one of the principal railroad lines of Rumania which, during its course in the latter country, runs along the west bank of the Sereth River. In Galicia, General von Bothmer's army successfully resisted strong Russian attacks along the Hajvoronka-Bobulinze line, north of Przevloka. Without cessation the furious fighting in the Kolki-Sokal sector on the Styr River continued. There General von Linsingen's German reenforcements had strengthened the Austro-Hungarian resistance to such an extent that it held against all Russian attempts to break through their line in their advance toward Kovel.