Question: What military branch was the author of Arabian Sands parts of?

full_context: Document 1: Book of Roads and Kingdoms (Ibn Khordadbeh): The Book of Roads and Kingdoms (, "Kitāb al-Masālik w’al- Mamālik") is a 9th-century geography text by the Persian geographer Ibn Khordadbeh. It maps and describes the major trade routes of the time within the Muslim world, and discusses distant trading regions such as Japan, Korea, and China. It was written during the reign of Al-Mu'tamid in around 870 CE, while its author was Director of Posts and Police for the Abbasid province of Djibal.
Document 2: Arthur Henderson (VC): He was 23 years old, and an Acting Captain in the 4th Battalion, The Argyll and Sutherland Highlanders (Princess Louise's), British Army, attached to 2nd Battalion during the First World War. On 23 April 1917 near Fontaine-les-Croisilles, France, he performed the deed for which he was awarded the Victoria Cross. He died the following day.
Document 3: Italian invasion of Egypt: The war was fought primarily in the Western Desert, which was about 390 kilometres (240 mi) long, from Mersa Matruh in Egypt, west to Gazala on the Libyan coast, along Via Balbia, the only paved road. The Sand Sea, 150 mi (240 km) inland, marked the southern limit of the desert at its widest at Giarabub and Siwa; in British parlance, Western Desert came to include eastern Cyrenaica in Libya. From the coast, extending into the hinterland lies a raised, flat plain of stony desert about 500 feet (150 m) above sea level, that runs 120–190 mi (200–300 km) in depth until the Sand Sea. The region is inhabited by a small number of Bedouin nomads, scorpions, vipers and flies.Bedouin tracks linked wells and the easier traversed ground; desert navigation was by sun, star, compass and "desert sense", good perception of the environment gained by experience. When Italian troops advanced into Egypt in September 1940,  the Maletti Group, lacking experience of desert conditions, got lost leaving Sidi Omar, disappeared and had to be found by aircraft. In spring and summer, days are miserably hot and nights very cold. The Sirocco (Gibleh or Ghibli), a hot desert wind, blows clouds of fine sand, which reduces visibility to a few yards and coats eyes, lungs, machinery, food and equipment; motor vehicles and aircraft need special oil and air filters and the barren ground means that water and food as well as military stores, have to be transported from outside.
Document 4: Gerald Cuthbert: Major-General Gerald James Cuthbert (12 September 1861 – 1 February 1931) was a British Army officer who commanded a battalion in the Boer War and a division in the First World War. Cuthbert joined the Scots Guards in 1882 and served in Egypt and the Sudan during the late 19th century. During the Boer War he served with his regiment, rising to command a battalion and after the war he was given command of a brigade in the Territorial Force and then in the British Expeditionary Force of 1914. He served on the Western Front from 1914 to 1917, rising to command 39th Division, then returned to home service before retiring in 1919.
Document 5: Brodie Haig: General Sir Arthur Brodie Haig, KCB, MC and bar (31 January 1886 – 9 February 1957) was a British officer in the Indian Army. A pre-war regular officer he served in India prior to the outbreak of the First World War when he was posted to the Middle East. He was wounded at the Battle of Shaiba, twice mentioned in dispatches and awarded the Military Cross (MC) before he was taken prisoner by the Ottoman Empire at the Siege of Kut. Escaping captivity in August 1918 he received a bar to his MC.
Document 6: William Holmes (Australian general): Major General William Holmes (12 September 1862 – 2 July 1917) was a senior Australian Army officer during the First World War. He was mortally wounded by a German artillery shell while surveying the ground won at the Battle of Messines.
Document 7: Maurice Dease: Maurice James Dease VC (28 September 1889 – 23 August 1914) was a British Army officer during the First World War. He was one of the first British officer battle casualties of the war and the first posthumous recipient of the Victoria Cross in the war.
Document 8: Torquhil Matheson: General Sir Torquhil George Matheson, 5th Baronet, KCB, CMG (4 February 1871 – 13 November 1963) was a Scottish officer who commanded three different divisions of the in British Army in some of the heaviest fighting of the First World War. He had previously served in the militia and with the Coldstream Guards in the Second Boer War. For his service, he was knighted in 1921 and in 1944 he inherited the Matheson baronetcy from his brother Roderick.
Document 9: Wild Arabia: Wild Arabia is a British nature documentary series, first broadcast on BBC Two and BBC HD from 22 February to 8 March 2013. Produced by the BBC Natural History Unit and narrated by Alexander Siddig, the three-part series focuses on the landscapes, wildlife and people of the Arabian Peninsula. Each episode is followed by a ten-minute "Wild Arabia Diaries" segment, illustrating the techniques used to film a particular subject.
Document 10: Muslim world: Ibn Tufail (Abubacer) and Ibn al-Nafis were pioneers of the philosophical novel. Ibn Tufail wrote the first Arabic novel Hayy ibn Yaqdhan (Philosophus Autodidactus) as a response to Al-Ghazali's The Incoherence of the Philosophers, and then Ibn al-Nafis also wrote a novel Theologus Autodidactus as a response to Ibn Tufail's Philosophus Autodidactus. Both of these narratives had protagonists (Hayy in Philosophus Autodidactus and Kamil in Theologus Autodidactus) who were autodidactic feral children living in seclusion on a desert island, both being the earliest examples of a desert island story. However, while Hayy lives alone with animals on the desert island for the rest of the story in Philosophus Autodidactus, the story of Kamil extends beyond the desert island setting in Theologus Autodidactus, developing into the earliest known coming of age plot and eventually becoming the first example of a science fiction novel.
Document 11: George Thesiger: Major-General George Handcock Thesiger (6 October 1868 – 27 September 1915) was a senior officer in the British Army during the First World War who was killed in action during the Battle of Loos by German shellfire. His career had encompassed military service in Egypt, South Africa, Ireland, British India and France and had been rewarded with membership in two chivalric orders.
Document 12: Women of Sand and Myrrh: Women of Sand and Myrrh is a novel written by Hanan al-Shaykh. It was originally published in 1989 as "Misk al-ghazal" () and was published in English in 1992. The English translator is Catherine Cobham. "Publishers Weekly" chose "Women of Sand and Myrrh" as one of the 50 best books of 1992.
Document 13: Arabian Sands: Arabian Sands is a 1959 book by explorer and travel writer Wilfred Thesiger. The book focuses on the author's travels across the Empty Quarter of the Arabian Peninsula between 1945 and 1950. It attempted to capture the lives of the Bedu people and other inhabitants of the Arabian peninsula. It is considered a classic of travel literature.
Document 14: Herman Landon: Major-General Herman James Shelley Landon, , (23 August 185916 October 1948), was a British Army officer. During the Boer War he commanded a battalion, and was promoted in the interwar period to take command of a brigade in the British Expeditionary Force. He commanded the brigade during the early fighting on the Western Front in the First World War, and succeeded to the command of 1st Infantry Division when his commanding officer was killed at the First Battle of Ypres; he later commanded four more New Army divisions during the war.
Document 15: Wahbi al-Bouri: Wahbi El-Bouri was an accomplished writer and is considered by many to be the father of the short story genre in Libya. He also wrote essays and other works of non-fiction on history and politics. He also translated a number of books in Italian about Libya. After his death Dr El-Bouri continued to be a character of inspiration for many Libyans to learn from his lifetime experience in Public Service as he served his country for almost 85 years and the numerous books he left behind, in 2011 after the Libyan uprising his family published his biography “Memories of my life”. In Jan 2017 El- Bouri’s grandson Zeid Basyouni and the El-Bouri family announced the establishment of the El-Bouri Foundation to continue Wahbi El-Bouri’s legacy as manifest in his great generosity of spirit which remained his trait up and aims to encourage and support young minds in the field of Writing, Literature, Public Service and Leadership.
ground_truth: British Army
sub_queries: Arabian Sands >> author Answer: Wilfred Thesiger
Wilfred Thesiger >> military branch Answer: British Army