On May 14, 1915, Ivanoff's right was being forced toward the Vistula in the vicinity of Opatow. This right wing was the army under General Ewarts, which since December, 1914, had been stationed in strongly fortified positions on the Nida in Russian Poland. The front extended across the frontier into western Galicia and joined on to the right wing of Dmitrieff's Dunajec-Biala front, which was shattered between Otfinow and Gorlice. The retreat of Dmitrieff's army was in an easterly direction along Tarnow, Pilzno, Dembica, Rzeszow, and Lancut to Przevorsk on the San; from the region of Gorlice and Ciezkovice along Biecz, Jaslo, Frysztak, Krosno to Dynow, Dubiecko, and Sanok, the latter also on the San. The troops that Brussilov extricated from the passes and those with which he held the northern part of the western Carpathians against Boehm-Ermolli were now likewise concentrated on the San. A glance at the map will show that the Russian front on the San from Przevorsk down to Sanok forms a shield between the Germanic advance and the two towns of Jaroslav and Przemysl. It will also be observed that General Ewarts's forces about Rozvadov are on the west side of the San, that is to say, nearer toward the advancing Austrians under the Archduke Joseph Ferdinand. The retreat in Galicia necessitated modifications in the Russian front in Poland on the way to Warsaw. The line south of the Pilica had to be withdrawn and positions on the Nida abandoned to conform with the retreating line in Galicia. New positions were taken up along Radom and across the Kamienna River. The pivot or hinge from which the line was drawn back was the town of Ivanlodz, about fifty-five miles southwest of Warsaw. North of Ivanlodz the front remained unaltered. While this line shifting was in progress (in Poland) the German troops hung closely to the heels of the retiring Russians, evidently mistaking the motive behind the change of position. Mr. Stanley Washburn thus summarizes the results of these retreating battles: "Regarding the movement as a whole, suffice it to say that in the two weeks following the change of line one (Russian) army inflicted upon the enemy a loss of nearly 30,000 in killed, wounded, and prisoners. The Russian losses were comparatively trifling." The Austro-German forces were following up leisurely the retreating Russian corps, not expecting any serious fighting to occur until the lines behind the Kamienna were reached. Instead of that, however, on May 15, 1915, the Russian commander suddenly halted the main body of his troops in front of his fortified positions on a line extending from Brody by Opatow toward Klimontow. Between May 15-17, 1915, a battle developed on this front, which is the more notable as it is one of the few in this war fought in the open without trenches. To quote Mr. Washburn: "In any other war it would have been called a good-sized action, as from first to last more than 100,000 men and perhaps 350 to 400 guns were engaged."