During
World War I, in which Denmark remained neutral, he was entrusted by the
Danish Foreign Minister,
Erik Scavenius, with missions to several countries with the purpose of finding an end to the conflict. Andersen, who was an intimate friend of the
Danish royal family, was well versed in dealing with royalty. He hoped to appeal the British king
George V and the Russian czar
Nikolai II who, along with the Danish king
Christian X, were all first cousins. He attempted unsuccessfully to initiate peace negotiations, but more successfully to secure Danish interests. Andersen, who was sympathetic to the
Allies, was most likely unaware that his diplomatic mission for peace was proposed to the Danish government by the German authorities, who were trying to probe ways to get Russia out of the war, so they could concentrate their efforts on the
Western Front. He was Siam's
Consul General in Denmark 1898–1932, became titular Councilor of State () in 1900, and was created
Knight of the Elephant, the highest Danish
order, in 1919. ==Further reading==