4th Mounted Division

The 4th Mounted Division was a short-lived British cavalry division composed of Yeomanry and Territorial Force units during World War I. It was formed on 20 March 1916, converted to 2nd Cyclist Division in July 1916 and broken up in November 1916. It remained in England on Home Defence duties throughout its existence.

Formation
The 4th Mounted Division was formed on 20 March 1916 from three second line mounted brigades (2/1st Eastern, 2/1st South Eastern and 2/1st South Western) and the new 2/1st Southern Mounted Brigade. The Headquarters was at Colchester and Brigadier-General (Major-General from 26 May) Lord Lovat was appointed to command. The Mounted Brigades were numbered on 31 March 1916.

2nd Cyclist Division
In July 1916 the yeomanry regiments were dismounted and their horses sent to remount depots. The regiments then converted to yeomanry cyclist regiments and the division was then renamed the 2nd Cyclist Division. It was assigned to the Southern Army, Home Defence Troops. Divisional Headquarters remained at Colchester and Lord Lovat remained in command. On reorganisation, 2/1st Essex Yeomanry, 2/1st Queen's Own West Kent Yeomanry and 2/1st Hertfordshire Yeomanry were posted to the 1st Mounted Division.

The Headquarters moved to Ipswich in September 1916. The division was broken up in November 1916, having remained in England on Home Defence duties throughout its brief existence. The cyclist brigades were dissolved and the yeomanry regiments were amalgamated in pairs to form yeomanry battalions in new cyclist brigades.