14 February – 15 March
The Russians advanced rapidly into Poland, which the Germans were now abandoning. Without much resistance from the Germans the cities of Siedlice, Spiff and Plock fell, while Warsaw was under siege by the Russians.
However, by mid March, the Germans launched their first attack on Russian positions in Bohemia and with near equal odds, many feared a German victory over the Russian defenders. However, additional Russian reinforcements were not far away. Just north of Brno were 52,000 Russian troops available, while in Sankt-Pölten 104,000 Russians were crushing the last of the Austrian army.
The Battle of Vienna was won by the Russians at a terrible loss rate for the Austrians. Their attempt to save their capital can be called heroic or stupid, but the fact was that after the war the entire Austrian army was destroyed, save several divisions. Fortunately for the Austrians, they were not the only ones in the same position, the Battle of Budapest was also lost by the Hungarians. And despite their best attempts to relieve the city, the Russians stood their stand and repulsed all Hungarian attacks
By the 15th of March, it appeared that the Central Powers were close to collapse. Bulgaria was attacked from all sides, Austria and Hungary were collapsing, while the Ottoman Empire rapidly lost lands in Arabia and Eastern Anatolia. The only Central Power who had any success was Germany, who occupied Northern France and Belgium. On the East, however, they suffered heavy losses and were slowly being pushed back, as a matter of fact they didn’t win a battle against the Russians since 1914/early 1915. Now the Russians were pushing into Germany and the Germans were rapidly losing control over the front. They decided it was time to dig in, as it had stopped their advance in France, it might stop the Russian advance into Germany.