The 4th Army (German: 4. Armee / Armeeoberkommando 4 / A.O.K. 4) was an army level command of the German Army in World War I. It was formed on mobilisation in August 1914 from the VI Army Inspection.^[1] The army was disbanded in 1919 during demobilization after the war.^[2]

Quick Facts 4. Armee, Active ...

4. Armee 4th Army
Flag of the Staff of an Armee Oberkommando (1871–1918)
Active	2 August 1914 – 28 January 1919
Country	German Empire
Type	Army
Engagements	World War I Western Front Battle of the Frontiers Battle of the Ardennes First Battle of the Marne Race to the Sea First Battle of Ypres Second Battle of Ypres Third Battle of Ypres
Insignia
Abbreviation	A.O.K. 4

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At the outset of war, the 4th Army, with the 5th Army, formed the center of the German armies on the Western Front, moving through Luxembourg and Belgium in support of the great wheel of the right wing that was to pin down and defeat the French armies. The 4th Army defeated Belgian forces on the frontier, drove the French out of the Ardennes and then encountered the British Expeditionary Force in the "Race to the Sea" at the First Battle of Ypres. The 4th Army faced the British in Flanders for the rest of the war, notably defending in the Battle of Passchendaele (1917), attacking in the 1918 German spring offensive and finally being pushed back in the Hundred Days Offensive from August 1918.

At the end of the war it was serving as part of Heeresgruppe Kronprinz Rupprecht.^[3]

• 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.^[7]
• 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.

• 4th Army (Wehrmacht) for the equivalent formation in World War II
• German Army order of battle (1914)
• German Army order of battle, Western Front (1918)
• Schlieffen Plan