They often sacrificed large bodies of troops to save their guns. The lack of artillery was the main cause of their defeat; what little they could save from the wreck was therefore husbanded with jealous care. The German staff accurately calculated on the preponderance of heavy artillery, and that Russia would be compelled to bow low before the superior blast of cannon fire. Though it involved the sacrifice of many miles of territory, it was now the Russian object to draw the enemy's line out to the fullest extent. After the retreat from the Wistok the Russian Generalissimo, Grand Duke Nicholas, was concerned only to save the most for his country at the greatest expense to her enemies. It meant continual retreat on a gigantic scale. Przemysl, captured ten weeks ago, lay behind Ivanoff's line, and Lemberg was but sixty miles beyond. Two hundred miles northward the Germans were hammering at the gates of Warsaw. A retreat such as the grand duke contemplated might involve the loss of all three of these places, but it would stretch the Germanic lines enormously and enable the Allies in the west to strike with better effect. No territorial considerations must stand in the way against the safety of the Russian armies. It was the same policy that had crippled Napoleon in 1812. * * * * * CHAPTER XXXI CAMPAIGN IN EASTERN GALICIA AND THE BUKOWINA In order to keep the narrative abreast of the steadily advancing Austro-German line, we must change occasionally from one sector to another to watch the progress of operations over the huge battle field. In accordance with the details laid down in the great strategic plan, each of the different Germanic forces had a distinct task to perform. Turning then to eastern Galicia and the Bukowina, we find that on May 1, 1915, the Austro-Hungarian and Russian armies were facing each other along almost the same front where we left them in the middle of March. That front extended to the north of Nadvorna and Kolomea, by Ottynia across to Niczviska on the Dniester, and from there eastward along the river toward Chotin on the Russian frontier of Bessarabia.