XI Corps (German Empire)

XI Army Corps XI. Armee-Korps
Flag of the Staff of a Generalkommando (1871–1918)
Active	30 October 1866 (1866-10-30)–1919 (1919)
Country	Prussia /  German Empire
Type	Corps
Size	Approximately 44,000 (on mobilisation in 1914)
Garrison/HQ	Kassel/Bellevue Palace, Schöne Aussicht 5
Shoulder strap piping	Red
Engagements	Franco-Prussian War Battle of Wissembourg Battle of Wörth Battle of Sedan World War I Battle of the Frontiers First Battle of the Masurian Lakes Battle of the Vistula River German summer offensive 1915 Bug–Narew Offensive Second battle of Przasnysz Narew Offensive Battle of Amiens
Insignia
Abbreviation	XI AK

The XI Army Corps / XI AK (German: XI. Armee-Korps) was a corps level command of the Prussian and German Armies before and during World War I.

XI Corps was one of three formed in the aftermath of the Austro-Prussian War (the others being IX Corps and X Corps). The Corps was formed in October 1866 with headquarters in Kassel. The catchment area included the newly annexed Province of Hesse-Nassau and the Thuringian principalities (Saxe-Weimar, Saxe-Meiningen, Saxe-Coburg and Gotha and Waldeck).^[1]

During the Franco-Prussian War it was assigned to the 3rd Army.

The Corps was assigned to the VI Army Inspectorate but joined the predominantly Saxon 3rd Army at the start of the First World War.^[2] It was still in existence at the end of the war^[3] in the 6th Army, Heeresgruppe Kronprinz Rupprecht on the Western Front.^[4] The Corps was disbanded with the demobilisation of the German Army after World War I.