sentences:  Persigny, the French ambassador to Britain, warned the Emperor that war with Britain was a real possibility unless some kind of alliance with Britain was signed, and that with such an alliance in being it did not matter what other European states thought.Rouher presented the Emperor with his commercial plan with sixty pages of favourable arguments, which the Emperor approved.The Emperor announced the treaty in a letter published on 15 January 1860 and it caused fury among the protectionist interests.