In March, 1831, a false report had reached London and Paris of the total defeat of the Poles, whereupon Sébastiani again instructed Talleyrand to urge, in the most pressing language, the British government to unite with France in insisting upon the humane treatment of the rebels. Palmerston, believing the insurrection to be at an end, readily promised to direct Lord Heytesbury to support the representations upon their behalf which the Duc de Mortemart had been enjoined to make at St. Petersburg.[164] Heytesbury, accordingly, intimated to Count Nesselrode that, were any measures to be adopted towards Poland at variance with existing engagements, both Great Britain and France would be under the necessity of remonstrating formally. The Kingdom of Poland, it should be remembered, had been constituted in 1815 under the guarantee of the five Powers, and it was, in consequence, possible to contend, with some show of reason, that all of them were equally concerned in the maintenance of the liberties conceded to the Poles, under the terms of the Vienna treaty. Heytesbury's conversations with Count Nesselrode convinced him, however, that, although the letter of that agreement might be observed, the Polish constitution would be virtually abolished. But, in reporting the nature of the intentions by which he conceived the Russian government to be animated, the able and experienced diplomatist who then represented Great Britain at St. Petersburg was at pains to point out the difficulties of the Tsar's position. In Russia there was a strong public opinion which even the autocratic Nicholas could not afford to disregard. Were former conditions to be restored in Poland, and were the authors of the cold-blooded assassinations at Warsaw to be permitted to escape unpunished, great indignation would be aroused throughout the Empire. His representations had been well received, but he was plainly allowed to see how deeply the St. Petersburg Cabinet regretted the existence of the close understanding between France and England, which his action had revealed. He could perceive clearly from the demeanour of his Austrian and Prussian colleagues that neither the Court of Vienna nor of Berlin would be disposed to interfere upon behalf of the Poles. France not Russia, he pointed out, was now looked upon as an object of common danger.[165]