The Sirius Dog Sled Patrol, first known as the North-East Greenland Sledge Patrol, was activated in the summer of 1941 during World War II to conduct long-range reconnaissance patrols along the northeast coast of Greenland thereby preventing German presence there. Its headquarters was at Eskimonaes, which had been until then a scientific station. At the time, the Germans established a number of secret weather stations on the eastern coast of the island to provide them with invaluable meteorological information both to assist their U-boat campaign and to predict the weather in the European theatre. Thus the patrol's discovery of these stations denied Germany such information with significant implications both for the Battle of the Atlantic and for air and land fighting in Europe, despite the enormous distance of Greenland from the main theatres of war.