 He later went to the island of Jan Mayen and various fishing grounds in Svalbard.He also spent several winters in Greenland, first in Northeast Greenland (1928–30), at Southeast Greenland (1931–33) and at Northeast Greenland again (1939–42).During World War II, he belonged to a sled patrol under Danish command that patrolled the Greenland coastlines on the lookout for German soldiers (1942–45).