Frederick III, upon learning of the death of Charles X in February 1660, had immediately proclaimed the Treaty of Roskilde null and void.

This has caused great alarm to the Swedish mediators, but their French and English counterparts assure them that if Sweden were to yield their claim to Trøndelag but otherwise stick by the terms of Roskilde, France and England would assure a treaty under those conditions.

Denmark insists on the return of the Scanian lands, with the support of Brandenburg, Austria and Poland, but this time Holland does not agree with Denmark.

Aadmiral Michiel de Ruyter and his Dutch fleet are on March 8 ordered to leave the harbor of Landskrona, where he has bottled up the Swedish fleet.

Frederick yields, and the negotiations begin in earnest on March 24.