Speaking from safe knowledge after the event, it is possible to indicate with moderate accuracy at least one of the ingenious stratagems adopted by the Germans to disguise their tremendous preparations against the Dunajec line. For months the fighting in this region had never been severe. When, therefore, local attacks and counterattacks on a small scale started on the Biala, as far back as April 4, 1915, Dmitrieff and his staff regarded this activity on the Austrians part as merely a continuation of the sporadic assaults they had grown accustomed to. Besides holding his own, Dmitrieff had on several occasions been able to assist Brussilov on his left. Until the big German drive commenced they had only been opposed to three Austro-German army corps and a Prussian division; now there were twelve corps on their front, supplied with enormous resources of artillery, shells, and cavalry. Most serious of all, Dmitrieff had neglected to construct second and third lines to which he could retire in an emergency. Of the rivers that lay behind him--the Wisloka, the Wistok, and the San--the first would be useful to cover Brussilov's position at the western passes, but beyond that he could not retreat without imperiling the whole Carpathian right flank. It was on this very calculation that the German plan--simple but effective--was based. The Russian grip on the Carpathians could only be released either by forcing a clear road through any pass into Galicia, or by turning one of the extreme flanks. Had the Austrians succeeded in breaking through as far as Jaslo, Dmitrieff would have been cut off and Brussilov forced to withdraw--followed by the whole line. The same result would follow if a thrust from the Bukowina succeeded in recapturing Lemberg. Both methods had been attempted, and both had failed. Germany's overwhelming superiority in artillery could not be effectively displayed in mountain warfare, but Dmitrieff's position on the Dunajec offered an easy avenue of approach. At the eleventh hour Dmitrieff grasped the situation and applied to Ivanoff for reenforcements. Owing to some blunder the appeal never reached the Russian chief, and Dmitrieff had to do the best he could. Nothing now could save his small force from those grim lines of gaping muzzles turned against his positions. The overture began on April 28, 1915, with an advance on the Upper Biala toward Gorlice, by Von Mackensen's right. Here some minor attacks had been previously made, and the gradually increasing pressure did not at first reveal the intent or magnitude of the movement behind it. Meanwhile the German troops about Ciezkovice and Senkova--respectively northwest and southeast of Gorlice--were moving by night nearer to the battle line. The Russian front line extended from Ciezkovice in a southeasterly direction. Hence it soon became clear that Gorlice itself was to be the main objective of the attack. A Russian official announcement of May 2, 1915, boldly states: