The 10th (Irish) Division, was one of the first of Kitchener's New Army K1 Army Group divisions, authorized on 21 August 1914, after the outbreak of the Great War. It included battalions from the various provinces of Ireland. It was led by Irish General Bryan Mahon and fought at Gallipoli, Salonika and Palestine. It was the first of the Irish Divisions to take to the field and was the most travelled of the Irish formations. The division served as a formation of the United Kingdom's British Army during World War I.
The 11th (Northern) Division, was an infantry division of the British Army during the First World War, raised from men who had volunteered for Lord Kitchener's New Armies. The division fought in the Gallipoli Campaign and on the Western Front. The division's insignia was an ankh or ankhus.
The 29th Division, known as the Incomparable Division, was an infantry division of the British Army, formed in early 1915 by combining various Regular Army units that had been acting as garrisons around the British Empire. Under the command of Major-General Aylmer Hunter-Weston, the division fought throughout the Gallipoli Campaign, including the original landing at Cape Helles. From 1916 to the end of the war the division fought on the Western Front in Belgium and France.
The 27th Division was an infantry division of the British Army raised during the Great War, formed in late 1914 by combining various Regular Army units that had been acting as garrisons about the British Empire. The division spent most of 1915 on the Western Front in France before moving to Salonika where it remained with the British Salonika Army for the duration of the war. In 1916 its commander Hurdis Ravenshaw was captured by an Austrian submarine whilst sailing to England. In 1918 in Salonika the division took part in the Battle of Doiran. It carried out occupation duties in the Caucasus in the post-war before being withdrawn from the region in 1919.
The 24th Division was an infantry division of the British Army, raised in September 1914 from men volunteering for Lord Kitchener's New Armies during the First World War. After almost a year spent training in England the division was sent to the Western Front between August and September 1915. It served in Belgium and France in the trenches of the Western Front for the duration of the war.
The 60th Division was an infantry division of the British Army raised during the First World War. It was the second line-formation of the 47th Division, and was the second of two such Territorial Force divisions formed from the surplus of London recruits in 1914.
The 34th Division was an infantry division of the British Army that was raised in 1914, during the First World War. The division was raised from volunteers for Lord Kitchener's New Armies, originally made up of infantry battalions raised by public subscription or private patronage. The division was taken over by the War Office in September 1915. It served in France and Belgium in the trenches of the Western Front for the duration of the war.
The 46th Division was an infantry division of the British Army, part of the Territorial Force, that saw service in the First World War. At the outbreak of the war, the 46th Division was commanded by Major-General Hon. E.J. Montagu-Stuart-Wortley. Originally called the North Midland Division, it was redesignated as the 46th Division in May 1915.
The 21st Division was an infantry division of the British Army during World War I, raised in September 1914 by men volunteering for Lord Kitchener's New Armies. The division moved to France in September 1915 and served on the Western Front for the duration of the First World War. The divisional insignia was the "triple-seven".
The 28th Division was an infantry division of the British Army raised for service in World War I.
The 25th Division was an infantry division of the British Army, raised as part of Lord Kitchener's Third New Army (K3) in September 1914, shortly after the outbreak of the Great War. It served on the Western Front for most of the war.
The 59th Division was an infantry division of the British Army during World War I. It was formed in late 1914/early 1915 as a 2nd Line Territorial Force formation raised as a duplicate of the 46th Division. After training in the United Kingdom and seeing service in the Easter Rising in April 1916, the division joined the British Expeditionary Force (BEF) on the Western Front in early 1917. It saw action at Ypres and Cambrai, and was almost destroyed during the German Army's Spring Offensive in March 1918. The reconstituted division took part in the final advances of the war.
The 226th Infantry Brigade was a Home Service formation of the British Army that existed under various short-lived titles in both World War I and World War II.
71st Division was a short-lived infantry division of the British Army during the First World War. It served in the Home Defence forces and never went overseas.
72nd Division was a short-lived infantry division of the British Army during World War I. It served in the Home Defence forces and never went overseas.
B Battery, Honourable Artillery Company was a horse artillery battery that was formed from the Field Artillery, HAC in 1899. It transferred to the Territorial Force in 1908 as artillery support for the South Eastern Mounted Brigade.
The Warwickshire Royal Horse Artillery was a Territorial Force Royal Horse Artillery battery that was formed in Warwickshire in 1908. It was the first Territorial Force artillery unit to go overseas on active service, spending the whole of the First World War on the Western Front, mostly with 1st Cavalry Division and 29th Division. A second line battery, 2/1st Warwickshire RHA, also served on the Western Front in 1917 and 1918 as part of an Army Field Artillery Brigade. Post-war it was reconstituted as a Royal Field Artillery battery.
The 2nd Home Counties Division was a 2nd Line Territorial Force division of the British Army in World War I. The division was formed as a duplicate of the 44th Division in November 1914. As the name suggests, the division recruited in the Home Counties, particularly Kent, Middlesex, Surrey and Sussex. In August 1915, in common with all Territorial Force divisions, it was numbered as 67th Division. Between September 1917 and the end of the year, the division was extensively reorganized and lost its territorial identity; henceforth it was known as 67th Division.
The 1st Staffordshire Artillery Volunteers, later 2nd North Midland Brigade, was a Volunteer unit of the Royal Artillery of the British Army recruiting primarily from Staffordshire. It fought on the Western Front during World War I and in the Normandy Campaign and Belgium, Holland, and Germany during World War II. Postwar, it was reformed as a specialist locating unit.
The Structure of the Egyptian Expeditionary Force over the course of the First World War is shown below.
United Kingdom 
British Army 