The XX Army Corps was a unit of the German Army that was stationed in Allenstein (today Olsztyn, Poland). At the beginning of World War I, the corps was transferred to the Eastern Front. [1]
In 1914, the component units of the division were:
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