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The British Army during World War I fought the largest and most costly war in its long history.〔Bourne (2001), pp. 118–119〕 Unlike the French and German Armies, its units were made up exclusively of volunteers—as opposed to conscripts—at the beginning of the conflict.〔Chappell (2003), p. 4〕 Furthermore, the British Army was considerably smaller than its French and German counterparts.〔Chappell (2003), p. 3〕 During the war, there were three distinct British Armies. The "first" army was the small volunteer force of 400,000 soldiers, over half of which were posted overseas to garrison the British Empire. This total included the Regular Army and reservists in the Territorial Force. Together, they formed the British Expeditionary Force (BEF), which was formed for service in France and became known as the Old Contemptibles. The 'second' army was Kitchener's Army, formed from the volunteers in 1914–1915 destined to go into action at the Battle of the Somme. The 'third' was formed after the introduction of conscription in January 1916, and by the end of 1918, the army had reached its maximum strength of 4,000,000 men and could field over 70 divisions. The vast majority of the army fought in the main theatre of war on the Western Front in France and Belgium against the German Empire. Some units were engaged in Italy and Salonika against Austria-Hungary and the Bulgarian Army, while other units fought in the Middle East, Africa and Mesopotamia—mainly against the Ottoman Empire—and one battalion fought alongside the Japanese Army in China during the Siege of Tsingtao. The war also posed problems for the army commanders, given that prior to 1914, the largest formation any serving General in the BEF had commanded on operations was a division. The expansion of the army saw some officers promoted from brigade to corps commander in less than a year. Army commanders also had to cope with the new tactics and weapons that were developed. With the move from manoeuvre to trench warfare, both the infantry and the artillery had to learn how to work together. During an offensive, and when in defence, they learned how to combine forces to defend the front line. Later in the war, when the Machine Gun Corps and the Tank Corps were added to the order of battle, they were also included in the new tactical doctrine. The men at the front had to struggle with supply problems; the shortage of food and disease was rife in the damp, rat-infested conditions. Along with enemy action, many troops had to contend with new diseases: trench foot, trench fever and trench nephritis. When the war ended in 1918, British Army casualties, as the result of enemy action and disease, were recorded as 673,375 dead and missing, with another 1,643,469 wounded. The rush to demobilise at the end of the war substantially decreased the strength of the army, from its peak of 4,000,000 men in 1918 to 370,000 men by 1920. ==Organization== The British Army during World War I could trace its organisation to the increasing demands of imperial expansion. The framework was the voluntary system of recruitment and the regimental system, which had been defined by the Cardwell and Childers Reforms of the late 19th century. The Army had been prepared and primarily called upon for Empire matters and the ensuing colonial wars.〔 In the last years of the 19th century, the Army was involved in a major conflict, the Second Boer War (1899–1902), which highlighted shortcomings in its tactics, leadership and administration. The 1904 Esher Report recommended radical reform, such as the creation of an Army Council, a General Staff, the abolition of the office of Commander-in-Chief of the Forces, and the creation of a Chief of the General Staff.〔Cassidy (2006), p. 78〕 The Haldane Reforms of 1907 formally created an Expeditionary Force of seven divisions, reorganised the volunteers into a new Territorial Force of fourteen cavalry brigades and fourteen infantry divisions, and changed the old militia into the Special Reserve to reinforce the expeditionary force.〔Cassidy (2006), p. 79〕 At the outbreak of the war in August 1914, the British regular army was a small professional force. It consisted of 247,432 regular troops organised in four Guards and 68 line infantry regiments, 31 cavalry regiments, artillery and other support arms.〔Tucker & Roberts (2005), p. 504〕 Each infantry regiment had two regular battalions, one of which served at home and provided drafts and reinforcements to the other which was stationed overseas, while also being prepared to be part of the Expeditionary Force. Almost half of the regular army (74 of the 157 infantry battalions and 12 of the 31 cavalry regiments), was stationed overseas in garrisons throughout the British Empire.〔 The Royal Flying Corps was part of the Army until 1918. At the outbreak of the war, it consisted of 84 aircraft.〔 The regular Army was supported by the Territorial Force, and by reservists. In August 1914, there were three forms of reserves. The Army Reserve of retired soldiers was 145,350 strong. They were paid 3 Shillings and 6 pence a week (17.5 pence) worth about £70 per week in 2013 terms, and had to attend 12 training days per year. The Special Reserve had another 64,000 men and was a form of part-time soldiering, similar to the Territorial Force. A Special Reservist had an initial six months full-time training and was paid the same as a regular soldier during this period; they had three or four weeks training per year thereafter.〔 The National Reserve had some 215,000 men, who were on a register which was maintained by Territorial Force County Associations; these men had military experience, but no other reserve obligation.〔〔 The regulars and reserves—at least on paper—totalled a mobilised force of almost 700,000 men, although only 150,000 men were immediately available to be formed into the British Expeditionary Force (BEF) that was sent to the continent. This consisted of six infantry divisions and one of cavalry.〔 By contrast, the French Army in 1914 mobilised 1,650,000 troops and 62 infantry divisions, while the German Army mobilised 1,850,000 troops and 87 infantry divisions.〔Addington (1984), p. 92〕 Britain, therefore, began the war with six regular and 14 reserve divisions. During the war, a further six regular, 14 Territorial, 36 Kitchener's Army and six other divisions, including the Naval Division from the Royal Navy were formed.〔Tucker & Roberts (2005), p. 505〕 In 1914, each British infantry division consisted of three infantry brigades each of four battalions, with two machine guns per battalion, (24 in the division). They also had three field artillery brigades with 54 18-pounder guns, one field howitzer brigade with eighteen s, one heavy artillery battery with four 60-pounder guns, two engineer field companies, one signals company, one cavalry squadron, one cyclist company, three field ambulances, four Army Service Corps horse-drawn transport companies and divisional headquarters support detachments.〔Tucker & Roberts (2005), p. 810〕〔Messenger (2005), pp. 25–26〕 The single cavalry division assigned to the BEF in 1914 consisted of 15 cavalry regiments in five brigades. They were armed with rifles, unlike their French and German counterparts, who were only armed with the shorter range carbine. The cavalry division also had a high allocation of artillery compared to foreign cavalry divisions, with 24 13-pounder guns organised into two brigades and two machine guns for each regiment. When dismounted, the cavalry division was the equivalent of two weakened infantry brigades with less artillery than the infantry division.〔 By 1916, there were five cavalry divisions, each of three brigades, serving in France, the 1st, 2nd, 3rd divisions in the Cavalry Corps and the 1st and 2nd Indian Cavalry Divisions in the Indian Cavalry Corps, each brigade in the Indian cavalry corps contained a British cavalry regiment.〔Gudmundsson & Anderson (2007), p.29〕 Over the course of the war, the composition of the infantry division gradually changed, and there was an increased emphasis upon providing the infantry divisions with organic fire support. By 1918, a British division consisted of three infantry brigades, each of three battalions. Each of these battalions had 36 Lewis machine guns, making a total of 324 such weapons in the division. Additionally, there was a divisional machine gun battalion, equipped with 64 Vickers machine guns in four companies of 16 guns. Each brigade in the division also had a mortar battery with eight Stokes Mortars.〔 The artillery also changed the composition of its batteries. At the start of the war, there were three batteries with six guns per brigade; they then moved to four batteries with four guns per brigade, and finally in 1917, to four batteries with six guns per brigade to economise on battery commanders.〔 In this way, the army would change drastically over the course of the war, reacting to the various developments, from the mobile war fought in the opening weeks to the static trench warfare of 1916 and 1917. The cavalry of the BEF represented 9.28% of the army; by July 1918, it would only represent 1.65%. The infantry would decrease from 64.64% in 1914 to 51.25% of the army in 1918, while the Royal Engineers would increase from 5.91% to 11.24% in 1918.〔Chandler (2003), p. 212〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「British Army during World War I」の詳細全文を読む スポンサード リンク
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