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The trade war between Britain and Napoleon reached a new level in 1807.  

British merchants were desperate for new markets.  The French were finding trouble, customs dues fell 80% despite the new Rhine river trade.  We've already talked a great deal about how the Russian economy was pushed to the brink.

Smuggling was the response.  The British smuggled into the Mediterranean via Malta, and into North Germany through Heligoland.  I'll tell you what percent of smuggled British goods were seized by the French officials, you will not believe it.

But the French kicked off an organized smuggling campaign as well, involving 6 different government departments, requiring a lot of paperwork.  But under the cover of all this smuggling, quite secretly, banking was taking place.