[5] He was not involved with the Norwegian Nazi party, Nasjonal Samling, before the Second World War reached Norway in 1940.

[7] On his way to Elverum Irgens encountered some members of the Storting at Hamar Station, stating his intention to meet with the King.

[8] Irgens arrived at Elverum late in the evening of 10 April, being allowed to sleep in Minister Hjelmtveit's bed for a few hours before seeing the King the next morning.

[9] The Norwegian government refused Quisling's demands and vowed to resist the German invasion as long as possible.

When Reichskommissar Josef Terboven formed a cabinet on 25 September 1940, Irgens accepted the position as provisional Minister of Shipping.

[12] As part of the legal purge in Norway after the war, in 1945, Irgens was sentenced to seven years of forced labour.