field armies. Army inspectorate Germany was divided into army inspectorates, each of which oversaw three or four corps. There were five in 1871, with three more added between 1907 and 1913. I Army Inspectorate: Headquartered in Danzig, became the 8th Army on mobilisation (2 August 1914) II Army Inspectorate: Headquartered in Berlin, became the 3rd Army on mobilisation (2 August 1914) III Army Inspectorate: Headquartered in Hannover, became the 2nd Army on mobilisation (2 August 1914) IV Army Inspectorate: Headquartered in Munich, became the 6th Army on mobilisation (2 August 1914) V Army Inspectorate: Headquartered in Karlsruhe, became the 7th Army on mobilisation (2 August 1914) VI Army Inspectorate: Headquartered in Stuttgart, became the 4th Army on mobilisation (2 August 1914) VII Army Inspectorate: Headquartered in Berlin, became the 5th Army on mobilisation (2 August 1914) VIII Army Inspectorate: Headquartered in Saarbrücken, became the 1st Army on mobilisation (2 August 1914) Corps The basic organizational formation was the army corps (). The corps consisted of two or more divisions and various support troops, covering a geographical area. The corps was also responsible for maintaining the reserves and in the corps area. By 1914, there were 21 corps areas under Prussian jurisdiction and three Bavarian army corps. Besides the regional corps, there was also a Guard Corps (), which controlled the elite Prussian Guard units. A corps usually included a light infantry () battalion, a heavy artillery () battalion, an engineer battalion, a telegraph battalion and a trains battalion. Some corps areas also disposed of fortress troops; each of the 25 corps had a Field Aviation Unit () attached to it normally equipped with six unarmed "A" or "B" class unarmed two-seat observation aircraft apiece. In wartime, the army corps became a mobile tactical formation and four (Higher Cavalry Commands) were formed from the Cavalry Inspectorate, the equivalent of corps, being made up of two divisions of cavalry. The areas formerly covered by the corps each became the responsibility of a (military district, sometimes translated as corps area). The military districts were to supervise the training and enlistment of reservists and new recruits. Originally each military district was linked to an army corps; thus Wehrkreis I took over the area that I. Armeekorps had been responsible for and sent replacements to the same formation. The first sixteen reserve corps raised followed the same pattern; X. Reserve-Korps was made up of reservists