Sweden and Prussia sign the Treaty of Hamburg, arranging a peace
between these two powers which had been antagonists in the Seven
Years' War.
Citation:
Editors. "Treaty of Hamburg between Sweden and Prussia".
The Literary Encyclopedia. First published 30 December 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=17780, accessed 19 May 2013.]