During early 1942, the "10th Mountain Werfer Battalion" was formed from the "104th Decontamination Battalion" and sent to "20th Mountain Army" in Finland. In late 1943, "Werfer-Battalion 11" was organized from two batteries already in Finland, including the battery from "Artillery Regiment 222" that participated in the invasion of Norway. A new "Panzerwerfer" battery was sent from Germany to be its third battery at the same time. Both battalions retreated into Northern Norway after the Finnish armistice in September 1944 after the Vyborg–Petrozavodsk Offensive.