August 1914 : headquarters and “B” Squadron based at Yeomanry House, Castle Hill, Reading. “A” Squadron at Windsor, “C” at Newbury, “D” at Wantage. Under command of the 2nd South Midland Mounted Brigade in the Mounted Division.
September 1914 : Brigade transferred to 2nd Mounted Division.
April 1915 : moved to Egypt.
August 1915, moved dismounted to Gallipoli. Withdrew back to Egypt in December.
January 1916 : Brigade became an independent command and was retitled as 6th Mounted Brigade.
February 1917 : Brigade transferred to Imperial Mounted Division.
June 1917 : Brigade transferred to Yeomanry Mounted Division.
April 1918 : merged with the with the Buckinghamshire Yeomanry to form C Bn, the Machine Gun Corps.
June 1918 : moved via Italy to France.
August 1918 : renumbered 101st Bn, the Machine Gun Corps.
Formed as a Second-Line regiment in September 1914 and remained at home throughout the war.
July 1916: converted into a Cyclist unit.
Formed as a Third-Line training unit in 1915.
Remained in United Kingdom until July 1917, when absorbed into 6th Reserve Cavalry Regiment.