Denmark reportedly took measures to prepare for a potential US invasion of Greenland, including deploying troops and explosives. Some reports suggest that the explosives were intended to blow up runways to prevent US aircraft from landing, while others mention that blood bags were also flown in, possibly in anticipation of casualties. The exact nature and extent of these preparations are not entirely clear, but it appears that Denmark made some level of military and logistical preparations in response to a perceived threat of a US invasion.