It started the war as a member of the 3rd Cavalry Brigade, 1st Cavalry Division. The 3rd Cavalry Brigade was transferred to the 2nd Cavalry Division on 13 September 1914.
As a unit of the 3rd Cavalry Brigade, 1st Cavalry Division, it will have taken part in the following battles and engagements.
The Cavalry Division had no permanent existence before the outbreak of War. The units of which it was composed on mobilization were quartered at various stations in England and Ireland, viz:- the 1st Cav. Bde., VII. Bde., R.H.A., 1st Field Sqd., R.E., 1st Signal Squadron, and No. 1 Signal Troop, at Aldershot; the 2nd Cav. Bde. and No. 2 Signal Troop, at Tidworth; the 3rd Cav. Bde., II. Bde., R.H.A., 4th Field Troop, 4th Cav. Bde., and No. 4 Signal Troop, were stationed at Canterbury, Shorncliffe, and London. The division crossed to France between the 15th and 18th August, concentrated to the East and South-east of Mauberge between the 18th and 20th August, and began to move forward on the 21st.Throughout the War the 1st Cavalry Division served on the Western Front in France and Belgium, and was engaged in the following operations:-
23 and 24 August
Battle of Mons.
24 to 05 September
RETREAT FROM MONS.
Battle of le Cateau [under II. Corps].
06 to 09 September
Battle of the Marne.
As a unit of the 3rd Cavalry Brigade, 2nd Cavalry Division, it will have taken part in the following battles and engagements.
12 to 15 September
BATTLE OF THE AISNE
12 October to 02 November
Battle of Messine [Cav. Corps].
13 to 17 October
Battle of Armentieres (3rd and 4th Cav. Bdes.) [Cav. Corps].
BATTLES OF YPRES
30 and 31 October
Battle of Gheluvelt (3rd Cav. Bde. and part of 4th and 5th Cav. Bdes.) [I. Corps].
BATTLES OF YPRES
26 April to 03 May
Battle of St. Julien [Plumer’s Force, Second Army].
24 and 25 May
Battle of Bellewaarde Ridge [V. Corps, Second Army].
In 1922, the Machine Gun Corps was disbanded and the guns returned to the Cavalry Regiment as a Machine Gun Troop.
In April 1922, the 16th Lancers (two squadrons) was amalgamated with the 5th Lancers (1 squadron) to form 16th/5th Hussars.