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Napoleon III's desire to annex Belgium, the Rhineland etc is well known.

What if he had, before the start of the Austro Prussian war exploited it and demanded Bismark give him a firm carte blache on Belgium and Luxembourg in exchange for his carte blache on Austria and been ready to move with speed to achieve this?

Mid June: The Austro-Prussian war kicks off.
Early July: Napoleon, not wasting any time, attacks Belgium with little warning.
Late June: Britain is throwing at s*#t fit. Its view of France changes from partner to enemy, Britain delivers Napoleon and ultimatum to quit Belgium, he refuses and Great Britain declares war on France.
The French realizing they could be in for a long war order stepped up mobilization to counter threat of foreign intervention.
July: Austria's army is crushed at the battle of Koeniggratz, similarly the main Belgian field army is crushed near Waterloo.
August: Austria surrenders as historical, Belgium is fully occupied.
Holland sells Luxembourg to France under threat of potential invasion.
The Prussian garrison surrenders as the majority of the Prussian army is still deployed against the Austrians. The German press however is outraged at this and there are calls for war on the French. Bismarck has this in mind and as soon as peace is cemented with Austria Prussian forces start to deploy to the Rhine for an attack on the French.
France withdraws from Rome and the Italians move to occupy the Pope's land.

The French are blockaded by the British, and the Prussians are preparing to attack in the next few months, the French are in a stepped up state of mobilization now. The Austrians have no interest in more war. The Russians just seem relieved the Anglo-French partnership has been broken.

So, what happens next?
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