Treaty of Hünkâr İskelesi

In late 1831, he sent his newly reformed army towards Syria, under the command of his son Ibrahim Pasha, resulting in the Egyptian–Ottoman War (1831–1833) against the Ottoman sultan, Mahmud II. Ibrahim's forces quickly captured Gaza and Jerusalem, and successfully laid siege to Acre before marching on to Aleppo and Damascus, “winning successive battles against Mahmud’s new troops, which were not yet a match for so practiced an enemy”; by June 18, 1832, Ibrahim had managed to seize control of all of Syria.[2] For a time, the Egyptian army halted while Mehmed Ali attempted to negotiate with the Sultan. However, once it became clear that diplomacy had failed, Ibrahim led his forces into Anatolia itself where he rallied opponents of the Sultan and captured the city of Konya on November 21.[3] Mahmud II dispatched a large army to try to halt the Egyptian advance, but it was crushed in the Battle of Konya on December 21 and “in a single blow [opened] the way for a complete conquest of Anatolia.”[4] Ibrahim continued his advance until he was within striking distance of Istanbul, the Ottoman capital.

Panic spread through the imperial city as the Egyptian army pushed closer to the seat of Ottoman authority. Mahmud II urgently dispatched pleas for assistance to both Britain and France, but was turned down due to domestic concerns as well as the involvement of both nations in managing the state of affairs after the recently ended Belgian Revolution. Lord Kinross argues that this left the Sultan no choice but to call upon his former enemy, Russia, for assistance.[5] According to Bailey, the response from the Tsar was so positive and swift, that Mahmud II hesitated in accepting, believing it might be a trap.[6] Nevertheless, the Sultan was willing to welcome any help he could receive, and accepted the Russian offer. The Tsar immediately dispatched a sizeable force of troops to block the potential Egyptian advance on Istanbul. It is unclear exactly how many troops the Tsar sent; Lord Kinross claims it was an army of approximately 18,000 men in total while Bailey suggests it may have been a force more than twice that size of nearly 40,000 troops.[7][8] Regardless of the exact size of the Russian host, it was formidable enough to cause Ibrahim to decide to begin negotiating with the Sultan rather than risk a battle with the Russians.[9] Thus, the mere presence of Russian troops was enough to halt the Egyptian onslaught.

The presence of Russian troops so close to the Ottoman capital also worried Britain and France considerably. Seeing this potential threat forced the two nations into action. Lord Palmerston, the British Foreign Secretary, led the effort and brought strong diplomatic pressure “to bear upon the Sultan to insist on the Russian withdrawal, in return for concessions to Mehmed Ali and an Anglo-French guarantee against his further invasion.”[10] Diplomacy was not the only tool they employed however, as both the British and the French dispatched fleets to the Dardanelles.[11] This action served the dual purpose of coercing the Sultan to accept their demanding proposal, while also threatening the Russians and checking any further military action they might take.

The Sultan finally submitted, which led to the Convention of Kütahya in May 1833, which officially granted Mehmed Ali control of Syria, Adana, Tripoli, Crete, and Egypt, though these titles were not guaranteed to be hereditary upon his death.[12] As soon as this peace was established, the Russians began the process of removing their troops from Ottoman territory. It seemed as though things had come to a reasonable end, but soon after the withdrawal of all Russian troops, the British government learned that two days prior to the completion of this evacuation, the Sultan Mahmud II had signed the Treaty of Hünkâr İskelesi with Tsar Nicholas I.[13] This realization alarmed British leaders, as it seemed to indicate that Russia now held an enormous amount of influence over the Ottoman Empire and its affairs.

The Bosporus (red), the Dardanelles (yellow), and the Sea of Marmara in between, are known collectively as the "Turkish Straits". Modern borders are shown.

This article called for an alternative to Ottoman military support per the terms of the treaty; rather than sending troops and arms in support of their Russian allies, the Ottomans would close the Dardanelles to all foreign warships at Russia's command. Below is the full text of the secret article:

“In virtue of one of the clauses of Article I of the Patent Treaty of Defensive Alliance concluded between the Imperial Court of Russia and the Sublime Porte, the two High Contracting Parties, are bound to afford to each other, mutually substantial aid, and the most efficacious assistance, for the safety of their respective dominions. Nevertheless, His Majesty the Emperor of all the Russias, wishing to spare the Sublime Ottoman Porte the expense and inconvenience which might be occasioned to it by affording such substantial aid, will not ask for that aid, if circumstances should place the Sublime Porte under the obligation of furnishing it. The Sublime Porte, in place of aid which it is bound to furnish in case of need according to the principal of reciprocity of the Patent Treaty, shall confine its action in favour of the Imperial Court of Russia to closing the Strait of the Dardanelles, that is to say, to not allowing any foreign vessel of war to enter therein, under any pretext whatsoever.”[15]

This article was highly controversial and its true meaning is still a matter of debate. There is disagreement over what exactly the terms of the closing of the Dardanelles would be. Some interpret the lack of any specific mention of Russian warships to mean that their ships were not included with those to be barred passage through the Dardanelles. Others point out that this same lack of any specific provision for Russian warships indicates that the treaty did not grant them any special rights. There is also debate over what is meant by the phrase “in case of need.” Some believe this meant only while Russia was at war, while others interpreted it to mean that the Dardanelles would be closed to foreign warships at all times. These speculations began when the British discovered the full scope of the treaty. The secret article was not officially communicated to the British government until January 16, 1834, but they were aware of it several months before that point.[16]

The British interpreted the treaty and its secret clause to have a potentially great impact on their relations with Russia, the Ottoman Empire, and the established balance of power. Hale argues that Lord Palmerston was stung into action “since he mistakenly believed that [the treaty’s] secret clause had given Russian warships free passage through the straits.”[17] Additionally, Palmerston and the rest of the British government saw that “while the immediate advantages of the treaty were slight, the ‘potential advantage to Russia’ was very great, in that ‘in accustoming the Porte to the position of vassal’ Russia had ‘prepared the way for a repetition of the 1833 expedition.’”[18] They feared that this potential for future Russian intervention in the Ottoman Empire would threaten British connections with India and trade in the Near East as a whole, though as Bailey puts it, “The Foreign Secretary’s immediate concern, however, was the problem of the Straits.”[19] This interpretation of the treaty was to shape British foreign policy towards the Ottoman Empire for decades to come.