The second phase of the eastern campaign was therefore opened from a new base—Thorn, where the main army had been gathered ever since Oct. 27, when the Russian danger had become alarming, and the offensive in the west had been abandoned. It was suddenly launched with irresistible force on Nov. 12, and rolled back numerically inferior Russian armies, whose task it had been to protect the right flank of the Russian advance on Silesia.
Recognizing the danger to their operations in South Poland and Galicia, where they had meanwhile approached the line of the Warta, Cracow, and Neu Sandec, the Russians threw troops into North Poland from all sides and succeeded in temporarily detaining the German advance there, while they were continuing their supreme efforts to break the Austro-German line south of Cracow. But the line held. At the same time the German drive in North Poland was making steady headway.
On Dec. 6 the Germans took Lodz, and further north advanced on Lowitz, and the Russian offensive in the Cracow district was given up. While all troops that could be spared were sent northeast to support the prepared lines of the Bzura and Rawka Rivers, the Russians in the south fell back behind the Nida and Dunajec, joining with their right wing their northern army in the region of Tomaschew, and extending their left through the region of Gorlitz and Torka toward the Pruth. In this line the Teutonic advance was checked. A new German drive on the road from Soldau to Warsaw could likewise make no headway beyond Mlawa, while on the other hand in East Prussia the Russian offensive had been brought to a standstill.
A siege warfare, like that in France, seemed imminent, except in the Bukowina, where Russian forces during January were driving Austrian troops before them. The Russian invasion of that province, however, so distant from all strategically important points, was but a political manœuvre.
The first movement of any consequence to occur was a desperate attempt of the Austrians early in February to push forward with their right wing in the direction of Stanislau, chiefly to bring relief to the garrison of Przemysl. Simultaneously they began sweeping the Russians out of Bukovina. The latter undertaking was successful, but the advance on Stanislau was thrown back toward Nadworna.
While the Austrian offensive was under way, General von Hindenburg unexpectedly launched a vigorous attack in East Prussia, which resulted in the destruction of the Russian East Prussian Army in the region of the Masurian Lakes. Once more a successful drive at the Russian "bread line" from the north seemed at hand. Already the armies pursuing the Russians were hammering at the Russian fortifications along the Niemen, Bobr, and Narew when the surrender of Przemysl, the siege of which had uninterruptedly gone on behind the Russian lines since November, on March 22 again presented to the Russians an opportunity to break the Austrian battleline.
To check the onslaught of the reinforced Russian armies against the Carpathian passes early in April, troops must be drawn from General von Hindenberg's armies, and the consequence was another deadlock in the north. Meanwhile the reinforced Teutonic troops were hurriedly concentrated for the counter-attack against the Russian offensive in the Carpathians, and a great drive began against the Russian positions on the Dunajec line, east of Cracow, early in May. Breaking all resistance, it swept on toward Jaroslau and Przemysl on a sixty-mile front.
Threatened in their right and left flanks, respectively, the Russian lines on the Nida and in the Carpathians fell back rapidly, while reinforcements were sent to stem the Teutonic advance along the San. But the Russian efforts were in vain. The momentum the Teutonic offensive had gained carried it across the river, while further south the Austrian right wing cleared the entire Carpathian front of the enemy, hotly pushing his retreat.
Przemysl was recaptured, the third Russian line of defense from Rawa-Ruska to Grodeck and the Dniester was broken, and the end of June saw Lemberg once more in the hands of the Teutons, and the Russian line on the defensive and sorely pressed along a front extending from the Bessarabian frontier along the Dniester to the mouth of the Zlota-Lipa, and from there along the Zlota-Lipa and the Bug, well into Russian territory, leaving the river southeast of Grubeschow, and continuing from there in a northwesterly direction to the region of Krasnik.
Here it joined hands with the left wing of the Russian Army of the Nida, which had retired before the Austro-German advance in a northeasterly direction, intrenching along a line from Krasnik across the Vistula and through Sjenno and Jastrshob (about fifteen miles southwest of Radom) to the region of Tomaschew on the Pilitza.