flown in, but the initial force became lost in the fog and did not arrive. Regardless, the airfield was not heavily defended and the German soldiers who did arrive captured it promptly. The Norwegian Army Air Service's Jagevingen fighter flight based at Fornebu Airport resisted with their Gloster Gladiator biplane fighters until ammunition ran out and then flew off to whatever secondary airfields were available. The ground personnel of the Fighter Wing soon ran out of ammunition for their anti-aircraft machine guns as well; in the general confusion and focus on readying the fighters for action, no one had the presence of mind or the time to issue small-arms ammunition for the personal weapons of the ground personnel. Resistance at Fornebu Airport came to an end, with the Germans' only loss being a single Junkers Ju 52. Norwegian attempts to mount a counter-attack were half-hearted and effectively came to nothing. On learning of this, Oslo was declared an open city and soon fully surrendered. For Gruppe 6 at Egersund and the paratroops at Stavanger, there was no significant opposition and they quickly captured their objectives. Battle of Midtskogen This battle, although very small, had saved the Norwegian Royal Family. As the invasion had begun, the Norwegian Government fled to nearby Hamar. Among them, a group of Norwegian Royal Guardsmen and some soldiers, possibly from the 5th Regiment in nearby Elverum took positions in Midtskogen to try to stop or slow down the Germans so that the Norwegian Royal Family could evacuate. In the morning of 10 April, a firefight ended with the retreat of both sides as Captain Spiller, the leader of the German Fallschirmjager, had been hit. Casualties are estimated to five Germans killed and an unknown number wounded, and three Norwegians hit. Conquest of Denmark The German plans for the invasion and occupation of Norway relied heavily on air power. In order to secure the Skagerrak strait between Norway and Denmark, the air bases in Denmark had to be seized. The domination of this strait would prevent the Royal Navy from interfering with the main supply lines of the invasion forces. In this respect, the occupation of Denmark was considered to be vital. The capture of Aalborg Airport was considered particularly important in this respect. The German Wehrmacht crossed the Danish border around 05:15 on 9 April. In a coordinated operation, German troops disembarked at the docks of