After Scania was ceded to the Swedish Crown in 1658, the good harbour and strong fort motivated plans to make Landskrona a commercial center of the acquired territory, with extraordinary privileges for foreign trade. The castle was reinforced by bastions, and the area inside the moats extended to 400x400 meters. The castle was considered the strongest and most modern in Scandinavia, but was temporarily lost to the Danes after a comparably short siege lasting from July 8 to August 2, 1676. The commandant, Colonel Hieronymus Lindeberg, was consequently sentenced to death for high treason. During the Danish reconquest in 1676-1679, Landskrona Citadel constituted as mobilisation centre for formal enlistment of pro-Danish guerrilla fighters.