repeatedly ravaged by fires that caused widespread damage, since many of its buildings were made of wood. The worst of these occurred in 1598, 1651, 1681, 1708, 1717 (twice), 1742, 1788, 1841 and 1842. The 1651 fire destroyed 90% of all buildings within the city limits. After the "Horneman Fire" in 1681, there was an almost total reconstruction of the city, overseen by General Johan Caspar von Cicignon, who was originally from Luxembourg. Broad avenues, such as Munkegata, were created, without regard for private property rights, with the aim of limiting the damage from any future fires. At the time, the city had a population of under 10,000 inhabitants, with most living in the downtown area. After the Treaty of Roskilde on 26 February 1658, Trondheim and the rest of Trøndelag became Swedish territory for a brief period, but the area was reconquered 10 months later. The conflict was finally settled by the Treaty of Copenhagen on 27 May 1660. During the Second World War, Trondheim was occupied by Nazi Germany from 9 April 1940, the first day of the invasion of Norway, until the end of the war in Europe, 8 May 1945. The German invasion force consisted of the German cruiser Admiral Hipper, 4 destroyers and 1700 Austrian Mountain troops. Except for a coastal battery that opened fire, there was no resistance to the invasion, which began on 9 April at 5 AM. On 14 and 17 April, British and French forces landed near Trondheim in a failed attempt to liberate Trondheim, as part of the Namsos Campaign. During the occupation, Trondheim was the home of the notorious Norwegian Gestapo agent, Henry Rinnan, who operated from a nearby villa and infiltrated Norwegian resistance groups. The city and its citizens were subjected to harsh treatment by the occupying power, including the imposition of martial law in October 1942. During this time, the Germans turned the city and its environs into a major base for submarines (which included building the large submarine base and bunker DORA I), and contemplated a scheme to build a new city for 300,000 inhabitants, Nordstern ("Northern Star"), centred southwest of Trondheim, near the wetlands of Øysand on the outskirts of Melhus municipality. This new metropolis was to be accompanied by a massively expanded version of the already existing naval base, which was intended to become the future primary stronghold of the German Kriegsmarine. A start