At the news that Ferdinand was dead and that serious disturbances had broken out, the French government proceeded to concentrate troops in proximity to the Spanish frontier. These military movements excited considerable alarm in London, where it was feared that they were a prelude to an active intervention. Palmerston, however, was soon satisfied that neither Louis Philippe nor the chief members of his government wished to despatch an army across the Pyrenees.[334] In the opinion of Duc de Broglie, the expulsion of Dom Miguel from Portugal was a necessary preliminary to any attempt to settle Spanish affairs. Both he and his colleagues, he declared, were prepared to respect England’s traditional dislike to any foreign intrusion in Portugal. But, under these circumstances, they had a right to expect, he contended, that great Britain should herself take the necessary measures for terminating a situation, which threatened to disturb the tranquillity of neighbouring States.[335]

Although very anxious to see peace restored, the British government wished to escape from the necessity of landing a military force in Portugal. It hoped to attain the desired result by concerting measures with Spain for the expulsion of both Pretenders. Seeing that Don Carlos was levying war from Portuguese territory against the government of the Queen Regent, the right of Spain to intervene was beyond question. In January, 1834, Cea Bermúdez had been succeeded by Martinez de la Rosa. The new minister entered readily into the plans of the British government and agreed to despatch an ambassador to London, provided with full powers to conclude a convention. Strict secrecy was observed about the negotiations, and it was only, on April 13, 1834, when all the details had been settled, that Palmerston showed Talleyrand a draft of the proposed treaty. Spain was to send an army against Dom Miguel, whilst England was to furnish Dom Pedro with naval assistance. It was not intended to invite France to be a party to this agreement; she would merely be asked to adhere to it.[336]

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.

In thus deciding to afford Queen Isabella material assistance, the French and English governments appear to have been strangely oblivious of their loudly proclaimed principle of “abstention from interference in the affairs of other States.” It was, doubtless, the inconsistency of their conduct in this respect which elicited from Talleyrand his cynical definition of the word non-intervention as “un mot métaphysique et politique qui signifie à peu près la même chose qu’ intervention.”[339] Both governments had, unquestionably, excellent reasons for desiring to put an end to a state of civil war and anarchy, which interfered with English trade, and had a disturbing effect upon the internal condition of France. In addition, there was the consideration, to which Palmerston attached much weight, that the Quadruple Treaty, by proclaiming the intimate union of the Liberal Powers, would counterbalance the league which the absolute Courts had, in the previous autumn, concluded at Münchengrätz.[340] Martinez de la Rosa, Christina’s chief minister, had been engaged in framing a constitutional Charter and the Estatuto Real,—the result of his labours—was about to be made public. Spain might, therefore, claim to be numbered among the Liberal Powers of Europe. But there would seem to have been another, and a more exclusively national reason, for the support which the English government decided to extend to the cause of constitutionalism in Spain. For the past century Spain had constantly followed the impulse of France and that state of affairs had, on many occasions, proved detrimental to British interests. “Foreign influence, however,” wrote Lord Palmerston some years later, “can best be exerted over the Court of a despotic monarch and becomes much weaker, if not entirely paralyzed, when it has to act upon the constitutional representatives of a free people. The British government, therefore, perceived that, by assisting the Spanish people to establish a constitutional form of government, they were assisting to secure the political independence of Spain, and they had no doubt that the maintenance of that independence would be conducive to important British interests.”[341]

One of the chief reasons, therefore, which led England to enter into the Quadruple Treaty was to destroy that influence which, for more than a century, France had been striving to establish over the Spanish government. Her statesmen had constantly laid it down as the first principle of their policy that her ascendency must be supreme at the Court at Madrid. It was essential, they argued, that France should have no fears of an attack from beyond the Pyrenees, should she be engaged in war with her powerful eastern neighbours. On that account the Salic Law, the Duc de Broglie explained to Lord Granville, was distinctly advantageous to France, inasmuch as it debarred females from succeeding to the Spanish throne. Now that it was abolished, he pointed out, the French government had to contemplate the possibility that an Austrian Archduke might some day aspire to the hand of the Queen of Spain.[342] Louis Philippe not only endorsed the views of his minister in this matter, but frankly confessed to the British ambassador that the triumph of absolutism, in the person of Don Carlos, would suit him infinitely better than the establishment of a Liberal monarchy at Madrid. In that case “he was greatly afraid that the Peninsula would become the resort of all the revolutionists and republicans in Europe.”[343]

These being Louis Philippe’s opinions, it seems strange that he should not have attempted to dissuade his ministers from committing him to the Quadruple Treaty. The adoption of such a course, however, would have been very dangerous. The “citizen King” might in his heart greatly prefer les capuchons to les bonnets rouges,[344] but he dared not publicly proclaim these sentiments. Moreover, had France abandoned the English alliance she would not have been received into the league of the absolute Courts. Louis Philippe, consequently, if he wished to avoid complete isolation, was compelled to appear to adopt the British policy. But his secret leanings being what they were and Palmerston’s object being what it was, it is not surprising that, from the moment of the conclusion of the Quadruple Treaty, symptoms of serious disagreement should have manifested themselves in the relations of the two governments.

Before the close of the year 1834 the Carlists were masters of the whole of Biscay and Navarre, with the exception of some of the larger towns. It was not alone the influence of the priests and the monks which induced the people of these provinces to espouse the cause of the Pretender so enthusiastically. They knew well that, were a representative form of government to be established throughout Spain, the Fueros,[345] those special rights and privileges to which they were devotedly attached, must either be abolished or greatly curtailed. A leader arose in Zumalacárregui, who quickly proved his superiority over the constitutional generals sent against him. Henceforward the struggle between the Carlists and the Christinos was carried on with a barbarity unknown in Europe for centuries. Neither side gave nor expected quarter. After every engagement wounded and unwounded prisoners were ruthlessly massacred. Such was the condition of affairs when a change of government took place in England.

Lord Grey had resigned, on July 9, 1834, on a question of Irish policy and had been succeeded as Prime Minister by Lord Melbourne. Signs were plentiful that the Whigs were losing their popularity in the country, and the King resolved to dismiss his ministers at the first opportunity. The death of Lord Spencer gave him the pretext for which he was seeking. Althorp’s removal to the Upper House, he told Melbourne, had left the government so weakly represented in the Commons that he should call upon his ministers to resign. Sir Robert Peel, accordingly, undertook to form a new government, and Wellington accepted the post of Secretary for Foreign Affairs. The Duke had never approved of his predecessor’s policy of intervening in the disputed succession to the Spanish throne. But, soon after he had taken up his duties at the Foreign Office, an opportunity arose of interposing in a manner more in accordance with his views. In the course of a conference with Mr. Villiers, Martinez de la Rosa had suggested that the French and British governments should propose to both parties some arrangement for the exchange of prisoners and, generally, for mitigating the horrors of the war. The opening of communications with Don Carlos on these lines might with advantage be made to serve a double purpose. The commissioners, selected to proceed to the headquarters of the Pretender, might be instructed to impress upon him the hopelessness of his position, and to explain to him that he could obtain no assistance from the absolute Courts. An authoritative statement to that effect would, in the opinion of Martinez de la Rosa, be more useful than “six victories by her Majesty’s troops.” It would furnish Don Carlos with the excuse, for which he was believed to be seeking, for abandoning the struggle.[346]

Lord Eliot was, accordingly, dispatched to Spain. Ostensibly, his mission had no other object than the negotiation of some agreement for terminating the inhuman methods of warfare, which both parties had adopted. In reality, however, he carried with him secret instructions based upon the suggestions of Martinez de la Rosa. Whilst in Paris he was to communicate these to the Duc de Broglie, who was once more at the head of the Foreign Office, in order that the French commissioner might be furnished with identical instructions.[347] Hitherto, there had been no great cause for complaint as to the manner in which France performed the duties imposed upon her by the additional articles of the Quadruple Treaty. It was, therefore, with the utmost confidence that the request would be promptly complied with, that Wellington had decided to invite the French government to appoint some person to repair with Eliot to the seat of war. But Lord Cowley, who, upon the change of government, had succeeded Lord Granville as British ambassador in Paris, speedily ascertained that the Duke’s proposal was regarded with much disfavour. Nor was he long in doubt as to the quarter from which the opposition to it was inspired. Louis Philippe himself assured him, on April 2, that he dared not allow communications to be opened with Don Carlos, except in response to an official invitation from the government of the Queen Regent. But, although the Spanish ambassador shortly afterwards made the desired request, the King still hesitated to comply with it. He was greatly afraid, he told Lord Cowley, that Don Carlos would refuse to entertain the suggested proposals. Were the Pretender to take such a course, popular indignation would be aroused in France, and the government might be forced to march an army into Spain to enforce its demands.[348]