On April 17 Talleyrand was in a position to announce to the conference that France now gave her unqualified assent to the proposed terms of separation. On this occasion it was resolved, at the suggestion of the French plenipotentiary, that, should Belgium decline to adhere to the conditions in question, which the King of the Netherlands had accepted, all relations should be broken off between the five Powers and the Belgian authorities. To prove the satisfaction which this changed attitude on the part of the French government afforded them the plenipotentiaries of Austria, Prussia, Russia and Great Britain met, and recorded their agreement to the principle of the destruction of the barrier fortresses, the protocol of this conference of the four Powers being communicated in confidence to Talleyrand.[124]

The question of the nature of the coercion which should be applied to the Belgians, should they persist in laying claim to Luxemburg, was not easy of solution. The Grand Duchy formed part of the Germanic Confederation, and therefore it should have devolved upon the Federal Diet to take the steps required for restoring the sovereignty of the King of the Netherlands. Sébastiani, however, deprecated the idea of employing German troops for the purpose of enforcing the decisions of the conference. But on the understanding that both the strength of the contingent, which was to enter Belgium, and the date on which the military operations were to begin should be settled by the five Powers, the French government withdrew its objections.[125] Prince Leopold, at the same time, informed the members of the deputation, who had come to London to offer him the crown of Belgium, that he could not listen to their proposals, until the national congress should have accepted the conditions of the 11th and 12th protocols. No persuasion could move him from this resolution which met with the full approval of the British government. Talleyrand, however, as a compromise appears to have suggested the plan of proposing to the King of the Netherlands the cession of the province of Luxemburg, without the fortress, in return for a pecuniary indemnity.[126] This solution of the difficulty was considered so practicable by Lord Ponsonby that, upon his own responsibility, he left Brussels and journeyed to London to urge its adoption. The conference, in consequence of his representations, agreed to open negotiations with the King of the Netherlands for the purchase of Luxemburg and for “so much of the province of Limburg as would connect Maëstricht with North Brabant.”[127] But when June 1, the date which had been assigned as that on which the Belgians must signify their agreement to les bases de separation, went by without a favourable answer having been received from Brussels, the conference withdrew Ponsonby and decided to resort to measures of coercion. The action of the national congress, in electing Prince Leopold King of the Belgians on June 4, had no effect upon the decision of the Powers. “It has been used,” wrote Palmerston, “as a fresh opportunity for putting forward pretensions to portions of the territory of the King of Holland and by implication, at least, of repeating their determination to gain possession of them by force.”[128]

But, as the moment approached for setting in motion General Hinüber’s Federal corps d’armée, the French government evinced symptoms of alarm. Sébastiani begged Talleyrand to try by all means in his power to discover some less objectionable method of terminating the difficulty. The King and his ministers, he assured him, placed their entire trust in his wisdom and vast experience.[129] Casimir Périer impressed upon Lord Granville that he would be powerless to restrain the army, were the Prussians and the Dutch to attack the Belgians “ranged under the tricolour.” “Sufficient allowance,” he pleaded, “was not made for the weakness of a government sprung from a revolution.”[130] Talleyrand, however, reported that, in spite of his efforts and of those of Prince Leopold to make the Belgians listen to reason, they refused obstinately to accept the conditions imposed upon them. At the Hague there was, he believed, a keen desire to bring on a general war, whilst the Tsar Nicholas was not sorry that the attention of the western Powers should be diverted from Poland to the Low Countries. In England men’s minds were concentrated exclusively upon the Reform Bill, and the knowledge that France and Great Britain were confronted by grave domestic problems undoubtedly encouraged the Belgians to defy the conference. Under these circumstances, his favourite scheme, the partition of the country, appeared to him the only practicable solution of the question. But on this occasion the idea of acquiring some part of Belgium offered no attractions to the French government. “We are disposed to think,” answered Sébastiani, “that any partition would recall that of Poland, and would not be popular.”[131]

The determination of the Powers to impose by force of arms the terms of the protocols of January 20 and 27 was, however, growing weaker. In their desire to avoid a general war they agreed to depart from a decision, which they had once pronounced to be irrevocable. The event was to prove that by this concession they had sensibly increased the danger of that armed conflict between the nations, which they were so anxious to avert. At the sitting of the conference, on June 26, the plenipotentiaries, “in the interests of the general peace,” affixed their signatures to a protocol of eighteen articles for acceptance by Holland and Belgium.[132] The altered conditions, although they did not fulfil all their aspirations, were far more favourable to the Belgians than the terms of the former bases de séparation. The most important modification consisted in a provision for maintaining a status quo in Luxemburg, pending the negotiations which were to be carried out between Belgium, on the one hand, and Holland and the Germanic Confederation, on the other. Prince Leopold, when the protocol of the eighteen articles was laid before him, agreed to accept the crown provided, always, that the national congress could be brought to assent to the new conditions which it set forth. After several stormy debates in the assembly this stipulation was complied with, and on July 11, a deputation arrived in London to conduct the King to Belgium.

Leopold had been assured that, even should the King of the Netherlands decline to accept the eighteen articles, the Powers would none the less recognize him as the Sovereign of Belgium. But, when the refusal of King William was known in London, the plenipotentiaries of Austria, Prussia and Russia declared that their respective governments had decided to withhold their recognition of him. Leopold, however, wisely determined to adhere to his resolution and to be satisfied with the acknowledgment of France and Great Britain. Before finally leaving London he informed Lord Grey of his intention to renounce his English pension. Claremont was to be kept up and all his debts were to be paid, but, when these conditions had been fulfilled, his trustees would pay the balance of his annuity into the English exchequer. His decision to act in this manner was quickened, without doubt, by learning that in the House of Lords, Londonderry, an Opposition peer, purposed to raise the question of his retention of his English pension.[133]

During the month of July an affair of some delicacy was amicably settled between the Cabinets of London and Paris. For some time past the government of M. Périer had been trying to obtain redress for the indignities to which French subjects, especially those suspected of affiliation to masonic lodges, were exposed in Portugal. Palmerston admitted the justice of the French complaints and raised no objections when it was proposed to send a fleet to Lisbon to demand satisfaction.[134] On July 8, accordingly, Admiral Roussin forced the entrance to the Tagus and ranged his squadron within gunshot of the quays of Lisbon. The Portuguese government, under these circumstances, was compelled to accede to the demands which the admiral had been instructed to make, and the French fleet, shortly afterwards, withdrew, carrying off with it, however, several Portuguese vessels of war. But, although the affair gave rise to no complications between England and France, it was seized upon by an embittered Opposition in London, as an opportunity for denouncing the failure of the government to protect England’s “most ancient ally.”[135]

The refusal of the King of the Netherlands to accept the new conditions of separation, as defined in the protocol of the eighteen articles, was communicated to the conference by the Dutch minister, Verstolk. The despatch, dated July 12, 1831, concluded with the menace that, “were any Prince to accept the crown of Belgium without having acceded to les bases de séparation as laid down in the protocol of January 20, he would be regarded as in a state of war with His Majesty and as his enemy.”[136] The representatives of the Powers appear to have treated these ominous words very lightly. An intimation was conveyed to the Hague that hostilities must not break out afresh, but no active measures were taken to prevent a rupture of the peace. It was soon evident, however, that the King was fully resolved to put his threat into execution. On August 1, Chassé, the Dutch general commanding the citadel of Antwerp, denounced the armistice and gave notice that hostilities would begin on the 4th. Leopold at once appealed for help to France and England, and then placed himself at the head of a wing of his army upon the Scheldt. But the retreat of General Daine, commanding the Belgian division upon the Meuse, who abandoned his positions without firing a shot, compelled the King to fall back to Louvain. Here he made his dispositions for withstanding the Dutch inroad, but, in spite of the gallant example which he set his men, his army, at the first contact with the enemy, fled in wild confusion. In the meantime, however, Marshal Gérard had entered Belgium in command of 50,000 French troops, and, when Leopold was upon the point of being surrounded, Sir Robert Adair, the British minister at Brussels, prevailed upon the Prince of Orange to suspend hostilities. The Dutch, shortly afterwards, began their retreat closely followed by the French, and, by August 20, the last of the invaders had evacuated the territory of Belgium.

It had been an easy matter to bring the actual hostilities to a close, but the Dutch raid had none the less created precisely that situation which British diplomacy had always striven to avoid. The French were now in complete possession of Belgium. Palmerston, indeed, strongly suspected them of having instigated the King of the Netherlands to break the peace. Sir Richard Bagot, the British ambassador at the Hague, inclined to the belief that a secret understanding existed between the Dutch and French governments. “Talleyrand,” wrote Palmerston in a private letter to Granville, “proposed to me some time ago that we should goad the Dutch on to break the armistice, cry out shame upon them, fly to the aid of the Belgians, cover Belgium with troops and settle everything as we choose.” “It would seem,” reported Granville, “that the King of Holland rather expected from the French government approbation than opposition to his invasion.”[137] It is not improbable that the Cabinet of the Hague may have been led to believe that a rupture of the armistice would meet with approval in Paris. But, in order to have furthered French designs, it should have taken place at an earlier date. Talleyrand’s proposal to Palmerston, it is clear, must have been made in June, when he was telling Sébastiani that he could devise no other plan for settling the question of Belgium but that of partition. Once Leopold had been enthroned, however, he knew full well that no British government could acquiesce in the appropriation by France of any portion of his kingdom. The Dutch invasion, which might have served French policy, had it occurred whilst matters were still unsettled in Belgium, became simply an embarrassment and a certain cause of discord between France and England, after Leopold’s arrival at Brussels.[138] Talleyrand, therefore, who regarded the maintenance of cordial relations between the two countries as an object of far higher importance that any extension of French frontiers into Belgium, strove by all means in his power to second the efforts of the British government to bring the French occupation to a close as speedily as possible. But, whilst Palmerston attributed to French intrigues the Dutch attack upon Belgium, he himself was suspected by Stockmar[139] of having known of the King of Holland’s plans and of having connived at the invasion. A few weeks later, however, when in London upon a confidential mission, Leopold’s trusted counsellor satisfied himself that Palmerston was wholly innocent of any double dealing in the affair.

Casimir Périer had been on the point of resigning, in consequence of the defeat of the ministerial candidate for the post of President of the Chamber, when the news reached Paris of the Dutch inroad into Belgium. This new development at once caused him to change his plans and to decide to remain in office. Talleyrand was instructed to explain in London that it was only the necessity for immediate action which had induced the French government to order a French corps to enter Belgium, without previous consultation with the Powers. Lord Granville, at the same time, was informed that, upon the withdrawal of the Dutch, the French troops would return to France.[140] The news of the French intervention in Belgium aroused great excitement in London. The funds fell, and Palmerston was sharply questioned upon the matter in the House.[141] Ministers, however, reassured by the accounts of the intentions of the French government transmitted by Granville, took a cheerful view of the situation.[142] At a sitting of the conference, on August 6, Talleyrand announced that Marshal Gérard’s occupation of Belgium would cease directly the Dutch should evacuate the country. On this same occasion it was agreed that the scope of the French operations should be decided by the conference and that, under no circumstances, should they be extended to the right bank of the Meuse. It was further resolved that siege should not be laid to either Maëstricht or Venlo, on account of their proximity to the Prussian frontier.[143]