Battle of Galicia
In August 1914, Russian armies moved against both German East Prussia and one of Austria-Hungary's largest provinces, Galicia, straddling the present-day border between Poland and Ukraine. Its advance into Germany was soon repulsed but its Galician campaign was more successful. General Nikolai Ivanov overwhelmed the Austro-Hungarian forces under Conrad von Hötzendorf during the Battle of Galicia, and the whole Austrian front fell back over to the Carpathian Mountains. The fortress at Przemyśl was the only Austrian post that held out and by 28 September, was completely behind Russian lines. The Russians were now in a position to threaten the German industrial region of Silesia, making the defense of Przemyśl of importance to the Germans as well as the Austro-Hungarians.