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| 1915 |
| Feb. 4–22 |
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| Winter battle in Masuria. The Germans advanced and took Memel (Feb. 17), but a further German offensive in East Prussia (battle of Augustovo Forest, March 9–10) met with strong Russian resistance. | 1 |
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| March 22 |
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| The Russians captured Przemysl and were in a position to break through the Carpathian passes into northern Hungary, but Austrian forces drove them back (April 2–25). | 2 |
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| May 2 |
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| Beginning of the great Austro-German offensive in Galicia. The Russians, already suffering severely from lack of rifles, artillery, ammunition, and clothing, gave way at once (battle of Gorlice-Tarnow). The Austro-German armies crossed the Dunajec (May 3–5) and took Jaroslav (May 14). By May 15 they had reached the San and forced a crossing (battle of the San, May 15–23). Przemysl was retaken (June 3), and gradually the whole Russian south front collapsed. Lemberg fell (June 22), and farther east Zuravno (June 5) and Stanislav (June 8). The Dniester River was crossed on June 23–27. By the end of June the Austro-German forces had advanced almost 100 miles, had liberated Galicia and Bukovina, and had taken huge numbers of prisoners. | 3 |
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| July 1 |
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| Beginning of the second great offensive. The Austrians (Archduke Joseph Ferdinand) took Lublin and Cholm (July 31) and stormed Ivangorod (Aug. 4). In Courland the Germans took Windau (July 18) and Mitau (Aug. 1), while in northern Poland they (Gen. Max von Gallwitz with the 12th army) advanced to the Narev and took Warsaw (Aug. 4–7). The Germans took Kovno (Aug. 18) and stormed the key fortress of Novo-Georgievsk (Aug. 20). Brest-Litovsk fell into their hands (Aug. 25) and Grodno (Sept. 2). In the south the Austrians took Lutsk (Aug. 31) and Dubno (Sept. 8). The capture of Vilna (Sept. 19) marked the end of the great offensive. | 4 |
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