Gerard Leachman Brevet Lieut . - Colonel Gerard Evelyn Leachman CIE DSO ( 1880 - 12 August 1920 ) , was a British soldier and intelligence officer who travelled extensively in Arabia . Leachman was commissioned into the Royal Sussex Regiment and served in India and in the Boer War . He spent most of his career as a political officer in Mesopotamia , where he was instrumental in pacifying warring tribes to bring stability to the new country . Leachman also made various expeditions further south into Arabia , where he contacted Ibn Sa ' ud on behalf of the British government . He travelled as a naturalist of the Royal Geographical Society , but was in fact a British agent . With his dark , Semitic looks and skill at riding a camel , Leachman was easily able to pass as Bedouin and often travelled incognito . Leachman ' s first major expedition south into the Arabian Peninsula was in 1909 , during which he was involved in a ferocious battle between the Anaiza and Shammar tribes near Ha ' il . He was awarded Macgregor Memorial medal for reconnaissance in 1910 . In 1912 Leachman made a second expedition with the intention of crossing the Rub Al Khali , but was refused permission by Ibn Sa ' ud when he reached Riyadh and instead went to Hasa . He was the first Briton to be received by Ibn Sa ' ud in his home city . In December , 1915 , during the Siege of Kut , the British commanding officer , Major General Charles Townshend , ordered Leachman to save the British cavalry by breaking out and riding south . This he did and the cavalry were the only British unit to escape before the fall of the city to the Ottomans . Leachman was close to Gertrude Bell ' s friend Fahad Bey and fought with the Muntafiq tribal federation . Prior to the conclusion of the war , Leachman was assigned to the 17th Division , which was assigned the task of operating on both the left and right banks of the Tigris in an effort to advance north in order to secure as much territory from the Ottomans prior to the now inevitable surrender of the Ottoman Empire . Leachman was specifically assigned to Light Armoured Motor Brigade on the right bank of the Tigris , ostensibly with a special task to work with local tribes . After the war , he was assigned as Political Officer for the Mosul Division within Mesopotamia , up until October , 1919 . He was murdered during the 1920 insurrection by a sibling of Sheikh Dhari , from the Zoba tribe , near Fallujah on 12 August 1920 . Leachman had visited Dhari in an effort to renegotiate repayment of advances made to him by the government and to persuade him to remain loyal to the current administration , but was shot in the back by Dhari ' s son after a verbal disagreement over a local robbery . Leachman ' s death sparked an immediate outbreak of tribal uprisings on the Euphrates between Falluja and Hit , and was responsible for General Haldane ' s advance on the same area in September , 1920 . He was buried in the British Military Cemetery in Baghdad . He was played by Oliver Reed in " Al - Mas ' Ala Al - Kubra " ( aka " Clash of Loyalties " ) , a 1983 film financed by Saddam Hussein , which was nominated for the Golden Prize at the 1983 Moscow International Film Festival .