Talleyrand's account of this transaction was sent to Admiral de Rigny, not to the Duc de Broglie. The refusal of the Chamber to ratify his proposals for settling a long-standing dispute with the United States, respecting the indemnity to be paid for the seizure of certain ships between the years 1806 and 1812, had driven the Duke to resign. The conditions of the projected treaty caused the greatest irritation in Paris. "The effect would be disastrous," wrote Rigny, "were it to appear that France had entered into the agreement under the protection of England."[337] Talleyrand was, accordingly, directed to insist that France should be made a party to the treaty. After a lengthy and, at times, a heated discussion, Palmerston gave way and, on April 22, 1834, the instrument, known as the Quadruple Treaty, was signed by the representatives of Great Britain, France, Spain and Portugal. An article had been inserted into it stipulating that, "should the co-operation of France be deemed necessary by the High Contracting Parties the King of the French would engage to do, in this respect, whatever might be settled by common consent between himself and his august allies."
The immediate object of the alliance was rapidly achieved. The junction of a Spanish army under General Rodil with the constitutional forces, operating in Tras-os-Montes, was followed, on May 16, by a decisive victory over Dom Miguel at Asserceira. A week later both Pretenders capitulated at Evora Monte. Dom Miguel agreed to accept a small pension[338] and to retire to Italy, whilst Don Carlos, at his own request, was conveyed to England on board H.M.S. _Donegal_. But the elation of the allies at the rapid success which had crowned their operations was of brief duration. After a stay of little more than a week in London Don Carlos departed secretly, and, contriving to cross France undetected, reached Spain, where he appeared at the head of his followers in Biscay on July 9. This new development, both the French and British governments agreed, must be met by an extension of the scope of the Quadruple Treaty. Certain additional articles were, accordingly, formally annexed to it, on August 18, 1834. By the first of these, the King of the French undertook to hinder supplies and arms from reaching the Carlists from his southern provinces. By the second, His Britannic Majesty pledged himself to furnish Her Most Catholic Majesty with arms and ammunition and, in case of need, to supply naval succour; whilst by the third, the Regent of Portugal promised to render whatever military assistance it might be in his power to give.