It appears from Cavour's report of the meeting that Napoleon III had prepared very carefully for it, and had called the shots over the secret "Plombières Agreement" that resulted. Piedmont-Sardinia might be a regional power in terms of the Po Valley, but the France was a European great power. Nevertheless, Cavour was entirely upbeat over the agreement.[1][12] he tensions between the disparate objectives and expectations of the parties are nevertheless clear.