August 7, 1849
The Austrian Ministry of Foreign Affairs received a handwritten letter from the British Foreign Minister Palmerston, in which Palmerston opposed Schwarzenberg's proposal to "maintain the restoration of the boundaries established in 1815." Palmerston subtly indicated in the letter that it was impossible to restore the boundaries of 1815, and Belgium was destined not to become a member of the Kingdom of the Netherlands, so cooperation should only be sought under the current system.
Without British support, Felix Schwarzenberg had to abandon his strategy and turn to end the long-drawn-out Austria-Sardinia War.
Under the guidance of Felix Schwarzenberg, the Austrian Ambassador to Sardinia, representing Habsburg interests, was entrusted with the heavy responsibility and became the plenipotentiary representative for the negotiations.
