Question: Erling Christian Foss was a Danish civil engineer, famous for his contributions to the underground insurgency to resist which nation's occupation of Denmark?

Context articles: Erik Reitzel
Anker Engelund
Kristian Hindhede
Nils Foss
Erling Selvig
Danish resistance movement
Isaac M. St. John
Erling Foss
Ludwig A. Colding
Asger Ostenfeld

Erik Reitzel (10 May 1941 – 6 February 2012) was a Danish civil engineer who started work in 1964 and was for many years a professor at the Royal Danish Academy of Fine Arts and at the Technical University of Denmark, in the disciplines of bearing structures and structural design.
Anker Dolleris Engelund (30 May 1889 – 6 June 1961) was a Danish civil engineer and university professor.
Kristian Hindhede (19 August 1891 – 8 January 1969) was a Danish civil engineer and industrialist.
 He was a son of the physician and nutritionist Mikkel Hindhede.
Nils Foss (born May 11, 1928) is a Danish director and civil engineer.
 He was born into a family of well known engineers.
 Nils Foss is the founder of FOSS, which is a Danish family owned company, established in 1956.
Erling Christian Øverland Selvig (born 23 August 1931) is a Norwegian legal scholar and judge.
The Danish resistance movement (Danish: "Modstandsbevægelsen" ) was an underground insurgency to resist the German occupation of Denmark during World War II.
 Due to the initially lenient arrangements, in which the Nazi occupation authority allowed the democratic government to stay in power, the resistance movement was slower to develop effective tactics on a wide scale than in some other countries.
Isaac Munroe St. John (November 19, 1827 – April 7, 1880) was a Confederate States Army brigadier general during the American Civil War.
 He was a lawyer, newspaper editor and civil engineer before the Civil War and a civil engineer after the Civil War.
 As a civil engineer, he worked for the Baltimore and Ohio Railroad Company (mainly in Maryland) and the Blue Ridge Railroad Company in South Carolina before the Civil War.
 After the war, he worked for the Louisville, Cincinnati and Lexington Railroad in Kentucky; the city of Louisville, Kentucky; and the Chesapeake and Ohio Railway Company (mainly in Virginia and West Virginia).
Erling Christian Foss (25 February 1897 – 15 June 1982) was a Danish civil engineer, famous for his contributions to the Danish resistance movement.
 As a result of contacts with Ebbe Munck and the Danish army's intelligence service, he became involved with the resistance at an early stage of the German occupation of Denmark.
 In September 1943, he became a member of the Danish Freedom Council representing De Frie Danske.
Ludwig August Colding (13 July 1815 – 21 March 1888) was a Danish civil engineer and physicist who articulated the principle of conservation of energy contemporaneously with, and independently of, James Prescott Joule and Julius Robert von Mayer though his contribution was largely overlooked and neglected.
Asger Skovgaard Ostenfeld (13 October 1866 – 23 September 1931) was a Danish civil engineer who specialized in the theory of steel and reinforced concrete structures.
 He is now considered to be the founding father of the theory of structures in Denmark.