XX Corps (German Empire)

For the equivalent formation in World War II, see XX Army Corps (Wehrmacht).

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

XX Army Corps XX. Armee-Korps
Flag of the Staff of a Generalkommando (1871–1918)
Active	1 October 1912 (1912-10-01)–1919 (1919)
Country	German Empire
Type	Corps
Size	Approximately 44,000 (on mobilisation in 1914)
Garrison/HQ	Allenstein/Kopernikus-Platz 3
Shoulder strap piping	Light Blue
Engagements	World War I Battle of Gumbinnen Battle of Tannenberg (1914) First Battle of the Masurian Lakes Battle of the Vistula River

As the German Army expanded in the later part of the 19th century and early part of the 20th century, the XX Army Corps was set up on 1 October 1912 in Allenstein as the Generalkommando (headquarters) for the southern part of East Prussia. It took over command of 37th Division from I Corps and the newly formed 41st Division. General der Artillerie Friedrich von Scholtz, former commander of 21st Division, took command.^[1] It was assigned to the I Army Inspectorate.^[2] which became the 8th Army at the start of the First World War.

XX Corps served on the Eastern Front from the start of the war. In September 1915, the corps was upgraded to form Armee-Gruppe Scholtz, later Armee-Abteilung Scholtz, as part of the Army of the Niemen. It was reformed from Armee-Abteilung D in September 1918.^[3] It was dissolved after the war.

Peacetime organisation

The 25 peacetime Corps of the German Army (Guards, I - XXI, I - III Bavarian) had a reasonably standardised organisation. Each consisted of two divisions with usually two infantry brigades, one field artillery brigade and a cavalry brigade each.^[4] Each brigade normally consisted of two regiments of the appropriate type, so each Corps normally commanded 8 infantry, 4 field artillery and 4 cavalry regiments. There were exceptions to this rule:

V, VI, VII, IX and XIV Corps each had a 5th infantry brigade (so 10 infantry regiments)

II, XIII, XVIII and XXI Corps had a 9th infantry regiment

I, VI and XVI Corps had a 3rd cavalry brigade (so 6 cavalry regiments)

the Guards Corps had 11 infantry regiments (in 5 brigades) and 8 cavalry regiments (in 4 brigades).^[5]

Each Corps also directly controlled a number of other units. This could include one or more

Foot Artillery Regiment

Jäger Battalion

Pioneer Battalion

Train Battalion

Peacetime organization of the Corps^[6]

Corps	Division	Brigade	Units	Garrison
XX Corps	37th Division	73rd Infantry Brigade	147th (2nd Masurian) Infantry	Lyck, III Bn at Lötzen
			151st (2nd Ermland) Infantry	Sensburg, III Bn at Bischofsburg
		75th Infantry Brigade	146th (1st Masurian) Infantry	Allenstein
			150th (1st Ermland) Infantry	Allenstein
		37th Field Artillery Brigade	73rd (1st Masurian) Field Artillery	Allenstein
			82nd (2nd Masurian) Field Artillery	Rastenburg, Lötzen
		37th Cavalry Brigade	10th (East Prussian) Dragoons "King Albert of Saxony"	Allenstein
			11th (Pomeranian) Dragoons "von Wedel"	Lyck
	41st Division	72nd Infantry Brigade	18th (1st Posen) Infantry "von Grolman"	Osterode
			59th (4th Posen) Infantry "Baron Hiller von Gaertringen"	Deutsch-Eylau, Soldau
		74th Infantry Brigade	148th (5th West Prussian) Infantry	Elbing, III Bn at Braunsberg
			152nd (1st Alsasian) Infantry "Teutonic Order"	Marienburg, III Bn at Stuhm
		41st Field Artillery Brigade	35th (1st West Prussian) Field Artillery[7]	Deutsch-Eylau
			79th (3rd East Prussian) Field Artillery	Osterode
		41st Cavalry Brigade	5th (West Prussian) Cuirassiers "Duke Frederick Eugene of Württemberg"	Riesenburg
			4th (1st Pomeranian) Uhlans "von Schmidt"	Thorn
	Corps Troops		1st (East Prussian) Jäger Battalion "Graf Yorck von Wartenberg"	Ortelsburg
			2nd Fortress Machine Gun Abteilung	Lötzen (Fortress Boyen)
			23rd (2nd West Prussian) (Fortress-)Pioneer Battalion	Graudenz
			26th (Masurian) Pioneer Battalion	Graudenz
			20th (Masurian) Train Battalion	Marienburg
	Allenstein Defence Command (Landwehr-Inspektion)			Allenstein

World War I

Organisation on mobilisation

On mobilization on 2 August 1914 the Corps was restructured. 41st Cavalry Brigade was withdrawn to form part of the 1st Cavalry Division^[8] and the 37th Cavalry Brigade was broken up and its regiments assigned to the divisions as reconnaissance units. Divisions received engineer companies and other support units from the Corps headquarters. In summary, XX Corps mobilised with 25 infantry battalions, 9 machine gun companies (54 machine guns), 8 cavalry squadrons, 24 field artillery batteries (144 guns), 4 heavy artillery batteries (16 guns), 3 pioneer companies and an aviation detachment.

Initial wartime organization of the Corps^[9]

Corps	Division	Brigade	Units
XX Corps	37th Division	73rd Infantry Brigade	147th Infantry Regiment
			151st Infantry Regiment
			1st Jäger Battalion[10]
		75th Infantry Brigade	146th Infantry Regiment
			150th Infantry Regiment
		37th Field Artillery Brigade	73rd Field Artillery Regiment
			82nd Field Artillery Regiment
			11th Dragoon Regiment
			1st Company, 26th Pioneer Battalion
			37th Divisional Pontoon Train
			1st Medical Company
	41st Division	72nd Infantry Brigade	18th Infantry Regiment
			59th Infantry Regiment
		74th Infantry Brigade	148th Infantry Regiment
			152nd Infantry Regiment
		41st Field Artillery Brigade	35th Field Artillery Regiment
			79th Field Artillery Regiment
			10th Dragoon Regiment
			2nd Company, 26th Pioneer Battalion
			3rd Company, 26th Pioneer Battalion
			41st Divisional Pontoon Train
			2nd Medical Company
			3rd Medical Company
	Corps Troops		II Battalion, 5th Foot Artillery Regiment[11]
			15th Aviation Detachment
			20th Corps Pontoon Train
			20th Telephone Detachment
			26th Pioneer Searchlight Section
			Munition Trains and Columns corresponding to II Corps

Combat chronicle

On mobilisation, XX Corps was assigned to the 8th Army to defend East Prussia while the rest of the Army executed the Schlieffen Plan offensive in August 1914. It took part in the battles of Gumbinnen, Tannenberg and 1st Masurian Lakes. Immediately after 1st Masurian Lakes it joined 9th Army in Lower Silesia where it fought at the Battle of the Vistula River. By May 1915 it was back with 8th Army and on 26 May the commander of XX Corps, General der Artillerie Friedrich von Scholtz, was made commander of the Army, while retaining simultaneous command of his Corps. On 29 September 1915, the headquarters of 8th Army was dissolved. On 18 September 1915, XX Corps was upgraded to form Armee-Gruppe Scholtz, later Armee-Abteilung Scholtz, as part of the Army of the Niemen.

XX Corps was reformed from Armee-Abteilung D on 21 September 1918.^[12]

Commanders

The XX Corps had the following commanders during its existence:^[13][14]

Dates	Name	Notes
1 October 1912 to 28 October 1915	General der Artillerie Friedrich von Scholtz	Headquarters upgraded to Armee-Abteilung Scholtz
21 September 1918 to end of war[15]	Generalleutnant Viktor Albrecht	Headquarters reformed from Armee-Abteilung D[16]

Glossary

• Armee-Abteilung or Army Detachment in the sense of "something detached from an Army". It is not under the command of an Army so is in itself a small Army.^[17]
• Armee-Gruppe or Army Group in the sense of a group within an Army and under its command, generally formed as a temporary measure for a specific task.
• Heeresgruppe or Army Group in the sense of a number of armies under a single commander.

See also

• Germany portal

• Armee-Abteilung D
• German Army order of battle (1914)
• Order of battle at Tannenberg
• List of Imperial German infantry regiments
• List of Imperial German artillery regiments
• List of Imperial German cavalry regiments

References

1. The Prussian Machine Archived 29 July 2014 at the Wayback Machine Accessed: 7 April 2012
2. Cron 2002, p. 395
3. Cron 2002, p. 85
4. Haythornthwaite 1996, pp. 193–194
5. They formed the Guards Cavalry Division, the only peacetime cavalry division in the German Army.
6. War Office 1918, p. 259
7. Had a third (Horse Artillery) Abteilung of three batteries of 4 guns.
8. Cron 2002, p. 324
9. Cron 2002, p. 324
10. With a machine gun company
11. 4 heavy artillery batteries (16 heavy field howitzers)
12. Cron 2002, p. 85
13. German Administrative History Accessed: 9 April 2012
14. German War History Accessed: 9 April 2012
15. The Prussian Machine Archived 30 September 2015 at the Wayback Machine Accessed: 7 April 2012
16. Cron 2002, p. 85
17. Cron 2002, p. 84

Bibliography

• Cron, Hermann (2002). Imperial German Army 1914-18: Organisation, Structure, Orders-of-Battle [first published: 1937]. Helion & Co. ISBN 1-874622-70-1.
• Ellis, John; Cox, Michael (1993). The World War I Databook. Aurum Press Ltd. ISBN 1-85410-766-6.
• Haythornthwaite, Philip J. (1996). The World War One Source Book. Arms and Armour. ISBN 1-85409-351-7.
• Histories of Two Hundred and Fifty-One Divisions of the German Army which Participated in the War (1914-1918), compiled from records of Intelligence section of the General Staff, American Expeditionary Forces, at General Headquarters, Chaumont, France 1919. The London Stamp Exchange Ltd (1989). 1920. ISBN 0-948130-87-3.
• The German Forces in the Field; 7th Revision, 11th November 1918; Compiled by the General Staff, War Office. Imperial War Museum, London and The Battery Press, Inc (1995). 1918. ISBN 1-870423-95-X.