Whakaotihia te rerenga e whai ake nei: Ko Munthe-Kaas te tama a Otto H. Munthe-Kaas me te teina o Otto Ulrik Munthe-Kaas, he rangatira hoia. I mua i te Pakanga Tuarua o te Ao, ko tana papa te rangatira o te puni hoia i Setermoen, a ko ia te rangatira o te II Field Battalion i te 16th Infantry Regiment i te wa o te whakaekenga a Tiamana ki Norway. I mua i te pakarutanga o te pakanga, i tono a Hugo Munthe-Kaas mo te kamupene kaitiaki i Tromsø, i mahi ai ia i te wa o te whakaeke a Tiamana. I uru atu ia ki te komihana pakanga i Tromsø ka whakaaetia mo te mahi i roto i te 16th Infantry Regiment, ahakoa e rua tau te pakeke mo te kohinga. I mahi a Munthe-Kaas i te wā o te pakanga i Te Tai Tokerau o Norway hei kaitiaki i te ratonga karere, hei kaipatu i te
Ngā Pakanga o Narvik. I roa tana mahi tae noa ki te hekenga o te whenua nui o Norway i te 10 o Pipiri 1940.