The Treaty of Brömsebro of August 13, 1645 ended the Torstenson War between Sweden and Denmark-Norway, which had begun in 1643. Negotiations for the treaty began in February the same year in the village of Brömsebro in Blechingia. The military strenght Sweden ultimately forced Denmark to give in to Swedish demands ceding the Norwegian provinces of Jemtia and Herdalia as well as the Baltic Sea islands of Gotland and Ösel. In addition to this Sweden received the province of Hallandia for a period of 30 years. It was followed by the Treaty of Roskilde of 1658, which forced Denmark to further concessions.