The 21st Army Corps was an Army corps in the Imperial Russian Army. Their headquarters are in Kiev. Composition 33rd Infantry Division 44th Infantry Division Part of 3rd Army: 1914 - 1915 8th Army: 1915 2nd Army: 1915 5th Army: 1915 - 1916 12th Army: 1916 - 1917 4th Army: 1917 Commanders 1906-1909: Nikolai Ruzsky 1914-1915: Yakov Schkinsky sept 1917: Nikolai Bredov
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