Battle of Dybbøl
Lord John Russell had intervened with a proposal that the war should be submitted to a European conference on behalf of the United Kingdom; the proposal was supported by Russia, France and Sweden. The negotiations were influenced by the Prussian and Austrian victory in the Battle of Dybbøl, giving Otto von Bismarck and his delegation an advantage over their opponents. The conference broke up 25 June 1864 without having arrived at any conclusion.