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Since the Young Turk Revolution which seized power of the Ottoman government in 1908, Hussein was very aware that his dynasty was in no way guaranteed and thus he was open to Britain's invitation to crown him King of the Arab kingdom.
Kitchener wrote to one of Hussein's sons, Abdallah, as reassurance of Britain's support: "If the Arab nation assist England in this war that has been forced upon us by Turkey, England will guarantee that no internal intervention take place in Arabia, and will give Arabs every assistance against foreign aggression."
Sir Henry McMahon who was the British High Commissioner to Egypt, would have several correspondences with Sherif Hussein between July 1915 to March 1916 to convince Hussein to lead the rebellion for the "independence" of the Arab states.
However, in a private letter to India's Viceroy Charles Hardinge sent on December 4th, 1915, McMahon expressed a rather different view of what the future of Arabia would be, contrary to what he had led Sherif Hussein to believe:
"[I do not take] the idea of a future strong united independent Arab State " too seriously " the conditions of Arabia do not and will not for a very long time to come, lend themselves to such a thing."
Such a view meant that Arabia would be subject to Britain's heavy handed "advising" in all its affairs, whether it sought it or not.
In the meantime, Sherif Hussein was receiving dispatches issued by the British Cairo office to the effect that the Arabs of Palestine, Syria, and Mesopotamia (Iraq) would be given independence guaranteed by Britain, if they rose up against the Ottoman Empire.
The French were understandably suspicious of Britain's plans for these Arab territories. The French viewed Palestine, Lebanon and Syria as intrinsically belonging to France, based on French conquests during the Crusades and their "protection" of the Catholic populations in the region. Hussein was adamant that Beirut and Aleppo were to be given independence and completely rejected French presence in Arabia. Britain was also not content to give the French all the concessions they demanded as their "intrinsic" colonial rights.
Enter Sykes and Picot.
Sykes-Picot: the Gentlemen's Etiquette on Backstabbing

MPK1-426 Sykes Picot Agreement Map signed 8 May 1916.
(Image by Wikipedia (commons.wikimedia.org), Author: Author Not Given) Details Source DMCA
Francois Georges Picot was sent to negotiate with the British on November 23rd, 1915. He was chosen for this role due to his policy outlook of the "Syrian party" in France, which asserted that Syria and Palestine (which they considered a single country) were French property, for historical, economic, and cultural reasons. Approximately six months later, the top secret terms of the agreement were signed on May 16th, 1916. The map showcases the agreed upon 'carving up' of these Arab territories, to be the new jewels of Britain and France.
Notice Palestine is marked as an international zone in yellow. Palestine was recognised as something neither country was willing to forfeit to the other. And thus, according to the gentlemen's etiquette, meant that one would simply have to take it while the other wasn't looking, which is exactly what happened.
In 1916, Sir Mark Sykes created the Arab Bureau whose headquarters would be in Cairo, Egypt (which was under British rule), as a branch of British Intelligence and under the direction of Lord Kitchener. Among the notable members of the Arab Bureau was T.E. Lawrence, better known as "Lawrence of Arabia". The raison d'Ã ªtre of the Arab Bureau was to exact British control over Arabia via British Egypt.
The Arab revolt, led under the faà §ade of King Hussein, was launched in Hejaz in early June 1916, however, the hundreds of thousands of Arabs the British were expecting to defect from the Ottoman army and join the revolt"did not show up. Instead, British aircraft and ships were deployed, along with Muslim troops from British Egypt and elsewhere in the Empire. As the revolt continued to show its weaknesses and lack of support by the Arabs themselves, to such a point that Britain was starting to despair of its success, T.E. Lawrence (who was known as "the man with the gold"), organised a confederation of Bedouin tribal chiefs to fight alongside the British forces in the Palestine and Syria campaigns.
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