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The I Corps was a formation of the Imperial German Army. The headquarters of the corps were located in Königsberg. At the beginning of World War I, the corps was attached to the 8th Army and transferred to the Eastern Front.

In 1893, the component units of the corps were:

• 1st Division
• 2nd Division
• 1st Heavy Artillery Regiment von Linger
• 1st Light Infantry Battalion Graf York von Wartenberg
• 1st Pioneer Battalion Fürst Radziwill
• 18th Pioneer Battalion
• 1st Training Battalion

In 1900, the component units of the corps were:

• 1st Division
• 2nd Division
• 37th Division
• 1st Heavy Artillery Regiment von Linger
• 1st Light Infantry Battalion Graf York von Wartenberg
• 1st Pioneer Battalion Fürst Radziwill
• 18th Pioneer Battalion
• 1st Training Battalion

In 1912, the component units of the corps were:

• 1st Division
• 2nd Division
• 1st Heavy Artillery Regiment von Linger
• 1st Light Infantry Battalion Graf York von Wartenberg
• 1st Pioneer Battalion Fürst Radziwill
• 18th Pioneer Battalion
• 1st Training Battalion
• 2nd Zeppelin Battalion

At the outbreak of war in 1914, the component units of the corps were:

• 1st Division
• 2nd Division
• 1st Heavy Artillery Regiment von Linger
• 15th Reserve Artillery Regiment
• 1st Pioneer Battalion Fürst Radziwill
• 1st Training Battalion
• 14th Field Aviation Detachment

v • d • e Corps of the German Empire Regular Corps: Guard Corps | I | II | III | IV | V | VI | VII | VIII | IX | X | XI | XII | XIII | XIV | XV | XVI | XVII | XVIII | XIX | XX | XXI Reserve Corps: Guard Reserve Corps | I | III | IV | V | VI | VII | VIII | IX | X | XII | XIV | XV | XVIII | XXII | XXIII | XXIV | XXV | XXVI | XXVII | XXXVIII | XXXIX | XXXX | XXXXI Bavarian Corps: I | II | III | I Reserve | XV Reserve Other Corps: Landwehr | Ersatz | Marine

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