The Grand Duke Nicholas by this time understood the situation. He perceived that it was impossible to make a stand. The only thing to do was to retreat steadily until Germany's mass of war material should be used up, even though miles of territory should be sacrificed. It should be a retreat in close contact with the enemy, so that the Austro-German troops would have to fight for every mile. This meant a retreat not for days, but perhaps for weeks. It meant that Przemysl must be given up, and Lemberg, and even Warsaw, but the safety of the Russian army was of more importance than a province or a city.
On May 18th the German War Office announced their successes in the following terms: "The army under General von Mackensen in the course of its pursuit of the Russians reached yesterday the neighborhood of Subiecko, on the lower Wisloka, and Kolbuezowa, northeast of Debica. Under the pressure of this advance the Russians also retreated from their positions north of the Vistula. In this section the troops under General von Woyrach, closely following the enemy, penetrated as far as the region northwest of Kielce. In the Carpathians Austro-Hungarian and German troops under General von Linsingen conquered the hills east of the Upper Stryi, and took 8,660 men prisoners, as well as capturing six machine guns. At the present moment, while the armies under General von Mackensen are approaching the Przemysl fortresses and the lower San, it is possible to form an approximate idea of the booty taken. In the battles of Tarno and Gorlika, and in the battles during the pursuit of these armies, we have so far taken 103,500 Russian prisoners, 69 cannon, and 255 machine guns. In these figures the booty taken by the Allied troops fighting in the Carpathians, and north of the Vistula, is not included. This amounts to a further 40,000 prisoners. Przemysl surrendered to the German's on June 3, 1915, only ten weeks after the Russian capture of the fortress, which had caused such exultation."
General von Mackensen continued toward Lemberg, the capital of Galicia. On June 18th, when the victorious German armies were approaching the gates of Lemberg, the Russian losses were estimated at 400,000 dead and wounded, and 300,000 prisoners, besides 100,000 lost before Marshal von Hindenburg's forces in Poland and Courland. On June 23d Lemberg fell. The weakness of Russia in this campaign arose from the exhaustion of her ammunition supplies, but great shipments of such supplies were being constantly forwarded from Vladivostock.