You challenge, should you accept it, is to have, after 1648 but before 1830, a war where Russia, Denmark and France are on one side, and England or the UK is on the other side.
Bonus points if a) it is started by England/UK's actions in the Holy Roman Empire, and/or b) the war causes a political crisis in Britain.
Bonus points if a) it is started by England/UK's actions in the Holy Roman Empire, and/or b) the war causes a political crisis in Britain.