He joined the Norwegian Independent Company 1 in 1941. During World War II Knut Haukelid and the Kompani Linge group, sabotaged the Nazi Germany controlled heavy waterVemork plant in Rjukan in a long-range raid which began at an airfield in England. On February 28, 1943, the demolition team entered the Norsk Hydro plant and set explosive charges. The heavy water produced at a facility in occupied Norway was vital for the Third Reich's participation in the nuclear bomb race. The British War Cabinet also ordered Haukelid to sink the Norwegian ferry SF Hydro carrying the containers of heavy water across Lake Tinn. The ferry was sunk with hidden explosives on February 19, 1944, killing 4 Germans and 14 Norwegian civilians.
Post-war life
For his participation in these raids, Knut Haukelid received multiple awards including Norway's highest decoration for military gallantry, the War Cross with sword. He was awarded this decoration twice, in 1944 and 1947: the War Cross with two swords. In addition, Haukelid was decorated by the British with the Distinguished Service Order and later with the Military Cross. Haukelid graduated from the Norwegian Military Academy in 1948. He served as major in the Telemark Infantry Regiment, and was later appointed Lieutenant General and head of the Home guard of Greater Oslo. Haukelid became a lieutenant colonel in the Army Infantry in 1959 and served as colonel and head of Greater Oslo Homeguard from 1966 until his retirement in 1974. At the time of his retirement, Haukelid was an active Lieutenant General. Haukelid wrote his autobiography, Det demrer en dag in 1947. Other books such as Knut Haukelid's Skis Against the Atom and Thomas Gallagher's Assault in Norway: Sabotaging the Nazi Nuclear Program provide accounts of the Norway raid and Haukelid's participation.
Cultural references
The sabotage action against the Vemork plant was portrayed in the classic Norwegian 1948 film Kampen om tungtvannet. Haukelid played himself, as did the rest of the sabotage group, in the film released internationally as . A largely fictional account of the sabotage, The Heroes of Telemark, starred Richard Harris as Knut Straud. In the spring of 1984, on the 40th anniversary of the sabotage action against the heavy water plant at Vemork, the survivors of the Kompani Linge group who participated in the action were honored at a reception at the residence of the American Ambassador in Oslo. On October 18, 1985, Knut Haukelid was honored at the Second Annual Scandinavian-American Hall of Fame Banquet in Minot, North Dakota. The 2015 TV mini-series The Heavy Water War produced by the Norwegian Broadcasting Corporation also portrays Haukelid's role in the heavy water operations.