German Division Nr. 188 was raised in late 1939. It consisted of the 136th, 138th and 139th Mountain Replacement Regiments and the 112th Artillery Replacement Regiment, plus supporting units. It began the war on border guard duty in the mountainous region between Austria and Yugoslavia with the primary mission of training reservists and replacements for the regular mountain divisions. In the spring of 1941 it joined the invasion of Yugoslavia, with the three mountain regiments given responsibility of seizing control of Carniola and Carinthia on the Yugoslav side of the border, which they carried out quickly and effectively against little to no resistance.
After the campaign the division remained in reserve at Innsbruck. On 8 October 1943 it was redesignated as the 188th Reserve Mountain Division and reorganized with Reserve Mountain Regiments 136, 137, 138, and 139, each with two battalions, and Reserve Artillery Regiment 112, also with two battalions, and transferred to northern Italy. On 27 February 1944 it was transferred to Istria and served on anti-partisan duties. A few days later it was again redesignated as the 188th Mountain Division and its regiments were redesignated as Mountain Regiments 901, 902, 903, 904 and Mountain Artillery Regiment 1088. It surrendered in Istria when the war ended in 1945.
Generalleutnant z.V. Hans von Hößlin (Establishment-Capitulation) (20 Oct 1943 - 1 Mar 1944)
188th Reserve Mountain Division (Wehrmacht) Wikipedia
Major Peter Hörmann (8 Oct 1943-1 Feb 1944)
Italy & Slovenia (Oct 1943 - Mar 1944)Reserve-Gebirgsjäger-Regiment 136