Heistadmoen Army Camp in Kongsberg capitulated. The 3rd Division, commanded by Major General Einar Liljedahl and tasked with defending southern Norway, surrendered to the Germans in Setesdal on 15 April, having seen no action up to that point. Some 2,000 soldiers marched into captivity in the Setesdal capitulation. With the abandonment on 20 April of the Franco-British plans for recapturing the central Norwegian city of Trondheim, Ruge's strategy became practically infeasible. With the calling off of the Allied plans for recapturing Trondheim, British forces which had been landed at Åndalsnes moved into eastern Norway. By 20 April three British half-battalions had moved as far south as Fåberg, near the town of Lillehammer. The main British units deployed to eastern Norway in April 1940 were the Territorials of the 148th Infantry Brigade and the regular 15th Infantry Brigade. In a series of battles with Norwegian and British forces over the next weeks the Germans pushed northwards from Oslo, their main effort through the Gudbrandsdal valley. Particularly heavy fighting took place in places like Tretten, Fåvang, Vinstra, Kvam, Sjoa and Otta. In the Battle for Kvam on 25 and 26 April, the British managed to delay the German advance for two days of heavy fighting. Other German units broke through the Valdres and Østerdalen valleys, in the former case after heavy fighting and an initially successful Norwegian counterattack. During their advance northwards from Oslo the Germans regularly broke down Norwegian resistance using air strikes. Junkers Ju 87 dive bombers proved particularly effective in demoralizing Norwegian troops opposing the advance. The Norwegian forces' almost complete lack of anti-aircraft weapons allowed the German aircraft to operate with near impunity. Likewise, when German panzers were employed the Norwegians had no regular countermeasures. The British No. 263 Squadron RAF fighter squadron set up base on the frozen lake Lesjaskogsvatnet on 24 April to challenge German air supremacy, but many of the squadron's aircraft were destroyed by German bombing on 25 April. The four Gladiators that survived to be evacuated to Setnesmoen army base near Åndalsnes were out of operation by the end of 26 April. Setnesmoen was bombed and knocked out by the Luftwaffe on 29 April. Norwegian collapse in southern Norway After their capture of Kristiansand on 9 April the battalion-strong German invasion force in southern Norway permitted the evacuation of the civilian population from the city. At the same time the Germans moved to