IV Army Corps (IV Armeijakunta) was formed on 18 June 1941, it became the HQ of Kannaksen Ryhmä (Isthmus Group) on 1 March 1942
It was reformed as HQ of IV Armeijakunta on 4 March 1944 and disbanded on 3 December 1944.

Commanders

Kenraaliluutnantti Karl Lennart Oesch (18 June 1941 - 31 Jan 1942)
Kenraalimajuri Taavetti Laatikainen (25 Aug 1941 - 30 Aug 1941) (acting)
Kenraaliluutnantti Harald Öhquist (1 Feb 1942 - 1 Mar 1942)
Kenraaliluutnantti Taavetti Laatikainen (4 Mar 1944 - 3 Dec 1944)

Other militaria

A special medal was awarded to those who served in this unit, the Karelian Isthmus Cross.

(Courtesy of Jaska Petsola)

Soldiers of IV Army Corps (IV Armeijakunta) on parade in Vyborg (Viipuri/Viborg) 31 August 1941

(Courtesy of SA-kuva)

Sources used

Research by Mikko H.

Reference material on this unit

Eero Vankka - Pion P 14.IV AK:n Pioneeripataljoona 1941-1944
Antti Peltonen - Tammelan patteristo Jatkosodassa.Kertomus Raskas Patteristo 15:n Taipaleelta 17.6.1941-19.11.1944