| 1 |
Responsible for garrisons, depots, training areas and schools in East Prussia. |
| 2 |
Also known as Befehlshaber im Wehrkreis I. |
| 3 |
From 1921 to 1934, the Commander of 1 Infantry Division also served as Commander of Wehrkreis I, styled Befehlshaber im Wehrkreis I. |
| 4 |
In October 1934, the original seven Infantry Divisions of the Reichswehr were expanded into twenty-one Infantry Divisions of the new Heer which was formed as part of the Wehrmacht. Each new division was given a code name until October 1935 when they were given numbers. |
| 5 |
In October 1935, with the formation of Corps HQs in Germany, each Wehrkreis was associated with a Corps HQ with the same number. |
| 6 |
In August 1939, each Wehrkreis formed a separate HQ to replace the associated Corps HQ which was being mobilised |
| 7 |
An alternative title for Wehkreis I was stellv Generalkommando I Armeekorps (i.e. "in place of I Corps HQ") |