The 1st South Midland Mounted Brigade (later numbered as the 5th Mounted Brigade) was a yeomanry brigade of the British Army, formed as part of the Territorial Force in 1908.
It served dismounted in the Gallipoli Campaign before being remounted to serve in the Sinai and Palestine Campaign in the First World War.
In April 1918, it was merged with elements of the 3rd (Ambala) Cavalry Brigade to form 13th Cavalry Brigade. It remained in Palestine after the end of the war on occupation duties.
Under the terms of the Territorial and Reserve Forces Act 1907 (7 Edw.7, c.9), the brigade was formed in 1908 as part of the Territorial Force. It consisted of three yeomanry regiments, a horse artillery battery and ammunition column, a transport and supply column and a field ambulance.
As the name suggests, the units were drawn from the southern part of the English Midlands, predominantly Gloucestershire, Warwickshire and Worcestershire.
The brigade was embodied on 4 August 1914 upon the outbreak of the First World War. It moved to East Anglia and joined the 1st Mounted Division. On 2 September it was transferred to the 2nd Mounted Division and in mid November 1914 it moved with its division to Norfolk on coastal defence duties.
In April 1915, the 2nd Mounted Division moved to Egypt, the brigade arriving at Alexandria on 24 April. In May 1915 the brigade was designated 1st (1st South Midland) Mounted Brigade.
It was dismounted in August 1915 and took part in the Gallipoli Campaign. Each regiment left a squadron headquarters and two troops (about 100 officers and men) in Egypt to look after the horses.
The brigade landed at "A" Beach, Suvla Bay on the night of 17 August and moved into reserve positions at Lala Baba on the night of 20 August. On 21 August it advanced to Chocolate Hill under heavy fire and took part in the attack on Hill 112.
Due to losses during the Battle of Scimitar Hill and wastage during August 1915, the 2nd Mounted Division had to be reorganised. On 4 September 1915, the 1st Composite Mounted Brigade was formed from the 1st (1st South Midland), 2nd (2nd South Midland) and 5th (Yeomanry) Mounted Brigades. The brigade formed a battalion sized unit 1st South Midland Regiment. The brigade embarked for Mudros on 31 October and returned to Egypt in December 1915 where it was reformed and remounted.
The brigade left the 2nd Mounted Division on 3 and 4 January 1916 for Es Salhia. The brigade served as Corps Troops in Egypt from 21 January 1916. On 31 March 1916, the remaining Mounted Brigades were numbered in a single sequence. As a consequence, the 1st South Midland Mounted Brigade was redesignated as 5th Mounted Brigade on 20 April.
The 16th Machine Gun Squadron was formed as the Cavalry MG Squadron and joined the brigade in January 1917 and in the same month, the brigade joined the newly formed Imperial Mounted Division. With the division, it took part in the First and Second Battles of Gaza.
The brigade remained with the Imperial Mounted Division when it was renamed Australian Mounted Division on 30 June 1917. With the division, it took part in the Third Battle of Gaza including the Capture of Beersheba and the Battle of Mughar Ridge. It also resisted the Turkish counter-attacks in the Turkish Defence of Jerusalem. Three of the brigade's squadrons took part in the charge at Huj, the last British cavalry charge against enemy guns.
In March 1918, the 2nd Indian Cavalry Division was broken up in France. The Canadian (Canadian Cavalry Brigade) and British units (notably 7th Dragoon Guards, 8th Hussars and N and X Batteries RHA) remained in France and the Indian elements were sent to Egypt.
By an Egyptian Expeditionary Force GHQ Order of 12 April 1918, the mounted troops of the EEF were reorganised when the Indian Army units arrived in theatre. On 24 April 1918, the 2nd Mounted Division was formed on the Indian Establishment and the 5th Mounted Brigade was assigned to it.
On 24 April 1918, the 5th Mounted Brigade was merged with elements of the 3rd (Ambala) Cavalry Brigade:the Royal Gloucestershire Hussars remained with the brigade
the Warwickshire Yeomanry left the brigade and was merged with the South Nottinghamshire Hussars (of 7th Mounted Brigade) to form B Battalion, Machine Gun Corps. It was posted to France, arriving in June
the Queen's Own Worcestershire Hussars left the brigade on 5 May and became the XX Corps Cavalry Regiment
9th Hodson's Horse joined from 3rd (Ambala) Cavalry Brigade
18th King George's Own Lancers joined from 3rd (Ambala) Cavalry Brigade
16th Machine Gun Squadron remained with the brigade (but appears to have been renumbered)
5th Mounted Brigade Signal Troop remained with the brigade
in April, 5th Mounted Brigade Field Ambulance merged with Ambala Cavalry Field Ambulance to form 5th Combined Cavalry Field Ambulance
in April, 5th Mounted Brigade Mobile Veterinary Section merged with Ambala Mobile Veterinary Section to form 5th Cavalry Mobile Veterinary Section
On 22 July 1918, the 2nd Mounted Division was renumbered as the 5th Cavalry Division and the brigade as 13th Cavalry Brigade. The sub units (Signal Troop, Combined Cavalry Field Ambulance and Mobile Veterinary Section) were renumbered on the same date.
The brigade remained with 5th Cavalry Division for the rest of the war, taking part in the Affair of Abu Tellul, Battle of Megiddo, Capture of Damascus, and Occupation of Aleppo.
After the Armistice of Mudros, the brigade remained with 5th Cavalry Division in Palestine as part of the occupation forces. However, demobilization began immediately: the 14th Cavalry Brigade was broken up in September 1919, the 15th (Imperial Service) Cavalry Brigade in January 1920, and the rest of the division (and the brigade) in April 1920.
The 1st South Midland Mounted Brigade / 5th Mounted Brigade / 13th Cavalry Brigade had the following commanders: