Initially, the Corps catchment area comprised the entire Province of East Prussia, but from 1 October 1912 the southern part of the Province was transferred to the newly formed XX Corps District.
37th Division was transferred to XX Corps when it was formed on 1 October 1912.
[7] The 25 peacetime Corps of the German Army (Guards, I - XXI, I - III Bavarian) had a reasonably standardised organisation.
There were exceptions to this rule: Each Corps also directly controlled a number of other units.
The Divisions received engineer companies and other support units from the Corps headquarters.