This is the order of battle for both the Russian and German armies at the Battle of Tannenberg, August 17 to September 2, 1914.
Hindenburg at Tannenberg, by Hugo Vogel
8th Army (German Empire)
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The 8th Army was an army level command of the German Army in World War I. It was formed on mobilization in August 1914 from the I Army Inspectorate. The army was dissolved on 29 September 1915, but reformed on 30 December 1915. It was finally disbanded in 1919 during demobilization after the war.
Staff of the 8th Army, First Battle of the Masurian Lakes.
Staff of the 8th Army, autumn 1914, Imperial Castle in Poznań.
Image: Usdau Stab der 8.Armee