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Commander of the Eastern Front

After having their strength decimated by the Russians in the Brusilov Offensive, the Austro-Hungarian forces submitted their Eastern Front forces to Hindenburg's command on 27 July (except for Archduke Karl's Army Group in southeast Galicia, in which General Hans von Seeckt was chief of staff). General von Eichhorn took over Army Group Hindenburg, while Hindenburg and Ludendorff, on a staff train equipped with the most advanced communication apparatus, visited their new forces. At threatened points, they formed mixed German and Austro-Hungarian units while other Austro-Hungarian formations were bolstered by a sprinkling of German officers. Officers were exchanged between the German and Austro-Hungarian armies for training. The derelict citadel of the Brest Fortress was refurbished as their headquarters. Their front was almost 1,000 km (620 mi) and their only reserves were a cavalry brigade plus some artillery and machine gunners.