It was still in existence at the end of the war,[3] serving in the 17th Army, Heeresgruppe Kronprinz Rupprecht on the Western Front.

[4] The 25 peacetime Corps of the German Army (Guards, I – XXI, I – III Bavarian) had a reasonably standardised organisation.

Divisions received engineer companies and other support units from the Corps headquarters.

On mobilisation, XVIII Corps was assigned to the 4th Army forming part of the centre of the forces for the Schlieffen Plan offensive in August 1914.

It was still in existence at the end of the war, serving in the 17th Army, Heeresgruppe Kronprinz Rupprecht on the Western Front.