"The X Army Corps / X AK (German: X. Armee-Korps) was a corps level command of the Prussian and German Armies before and during World War I.
X Corps was one of three formed in the aftermath of the Austro-Prussian War (the others being IX Corps and XI Corps). The Corps was formed in October 1866 with headquarters in Hannover. The catchment area included the newly annexed Kingdom of Hanover (thereafter the Province of Hanover), the Grand Duchy of Oldenburg and the Duchy of Brunswick.
During the Franco-Prussian War it was assigned to the 2nd Army.
In peacetime, it was assigned to the III Army Inspectorate. which became the 2nd Army at the start of the First World War. It was still in existence at the end of the war in Armee-Abteilung B, Heeresgruppe Herzog Albrecht von Württemberg at the extreme southern end of the Western Front. The Corps was disbanded with the demobilisation of the German Army after World War I." - (en.wikipedia.org 02.09.2021)
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