Charles X Gustav's gamble ended with a catastrophic defeat for Denmark. The resulting Treaty of Roskilde, signed on 26 February 1658, was highly favorable for Sweden. Denmark ceded Scania, Blekinge, Halland, Bohuslän, Bornholm and Trøndelag to Sweden. Bornholm and Trøndelag were returned to Denmark in 1660 after Charles X Gustav's failed attempt to defeat Denmark completely in a second war. In its historiography, several historians have highlighted the campaign and the resulting peace treaty as the events that gave Sweden its current "natural" borders. Likewise, the events gave rise to a polarised debate over the role of quartermaster general Erik Dahlbergh in the king's decision to march across the Great Belt.