8th Army (2nd August 1914 - 29th September 1915)

The 8th Army was formed from  the I Army Inspectorate on mobalisation.

I Corps

1st Infantry Division
2nd Infantry Division

XVII Corps

35th Infantry Division
36th Infantry Division

XX Corps

37th Infantry Division
41st Infantry Division

I Reserve Corps

1st Reserve Infantry Division
36th Reserve Infantry Division

Landwehr Corps

3rd Landwehr Division
4th Landwehr Division

The Army was actived in Poznan to defend East Prussia against the expected Russian attack.  It was supported by the 1st Cavalry Division.

After the Battle of Gumbinnen on 19th/20th August 1914 the German Army was forced to start a withdraw behind the Vistula.  However, the victories at Tannenberg on the 26th-30th August 1914, and the Battle of the Masurian Lakes on the 6th-14th September 1914 stopped the Russian invasion.  The 8th Army under Hindenburg then moved south to support the 9th Army, which was falling back.

Field Marshal Hindenburg took over command of the German 9th Army, placing General Richard Von Schubert in charge of the 8th Army.  The Kaiser had already placed Hindenburg in command of operations on the Eastern Front.

In early 1915 the 10th German Army was created, and these armies took part in the Second Battle of the Masurian Lakes between the 2nd-27th February 1915.  

After the success of the German Army in 1915 the Army was re-organised and the front reinforced.  The XXXIX Reserve Corps was placed in Kurland and then expanded into Army Detatchment Leuenstein.  On 26th May 1915 the 8th Army HQ was withdrawn and renamed the Army of the Neiman,

The 8th Army designation was transfered to the XX Corps, commanded by General , This Army was disbanded on the 29th September 1915.