During the interwar period, it converted to artillery and during the Second World War one of its regiments distinguished itself during the retreat to Dunkirk, saw action during the Second Battle of El Alamein, and also saw service in Sicily and Italy.

When the Peace of Amiens broke down and the war was resumed in 1803, the Volunteers were quickly re-established in larger numbers, some units being reformed (sometimes with a different name), others being newly formed.

By 1812 the cavalry Troops of the Lambeth, Richmond, and Southwark Volunteers had disappeared from the lists, and the returns show no 'effective' men for the Croydon, Guildford, Wandsworth or Wimbledon corps.

[36][37] In November–December 1/1st Surrey Yeomanry was split up to provide a divisional cavalry squadron to each of the three new infantry divisions being formed from battalions brought back from India and other Imperial posts.

Calvert, A Squadron's usual work was road patrols and providing orderlies to headquarters, though they took part in anti-sniper stalking during the German attack on St Eloi on 14–15 March.

Other duties included making a dugout for the divisional commander, and working parties spent much of the summer erecting barbed wire in front of the British subsidiary line.

From late August the squadron began sending two dismounted Troops at a time to do front line trench duty with Princess Patricia's Canadian Light Infantry.

On 11 October 1st Battalion York and Lancaster Regiment attempted to drive the enemy out of Bairakli Jum'a; it was supported by A Sqn, an armoured car and two sections of field artillery.

At the end of the fever season XVI Corps reoccupied the Bulgarian side of the river in October as its winter line: the open right flank was to be covered by constant patrolling by the Surrey and Derbyshire Yeomanry.

The Struma Front remained relatively quiet until June 1918 when XVI Corps was relieved by Greek troops and moved to the Lake Doiran sector.

But by 22 September the Bulgarian front was crumbling, and XVI Corps HQ with its attached troops took over the left flank of the British Salonika Army (BSA) to continue the pursuit.

Borwick, the squadron's experiences were similar to A Sqn, providing mounted police patrols, conducting night-time anti-sniper sweeps, and fatigue parties for sandbag filling and trench digging (while their horses got fatter, the war diary complained).

[22][24][51][52] Under the command of Maj R. Bonsor, the squadron underwent training with new equipment used on the Western Front, including respirators and hand grenades, then went into billets at Acheux, providing working parties.

As the battle continued, the squadron was at Bavelincourt, sending Troops to be attached to different divisions as despatch riders or to the military police for traffic control.

[3][24] In February 1920 The Surrey Yeomanry (Queen Mary's Regiment) (TF) was reformed, Headquarters once again opened at 73 King's Avenue, Clapham, London.

[74][75][76] On 10 May 1940, the Phoney War ended with the German invasion of the Low Countries, so the BEF followed the pre-arranged Plan D and advanced into Belgium to take up defences along the River Dyle.

[81] 98th (S&SY) Field Rgt attached itself to 44th (HC) Division, but got caught in a traffic jam at Saint-Jans-Cappel on 29 May and the gunners were forced to destroy and abandon their guns and vehicles before proceeding on foot to the beaches for evacuation.

When field regiments were reorganised on a three-battery basis, 98th (S&SY) Fd Rgt formed 471 Bty in January 1941, armed with four French 75mm guns, while 391 and 392 Btys each had two of the new 25-pounders.

[72][87] On the second night of the Second Battle of El Alamein (24/25 October), 10th Armoured Division advanced with strong artillery support from its own regiments and several others, but the tanks could not keep up with the barrage and struggled up to Miteirya Ridge.

Early on 15 July the SP guns of 98th (S&SY) and 24th Fd Rgts were brought up to support 50th (Northumbrian) Infantry Division and 4th Armoured Brigade in their renewed attempts to gain a bridgehead.

The operation bogged down in close country and an attempt to restart it the next night broke down when the artillery was directed to fire on the Bottaceto itself, while German troops were still in position in front of it.

[94] After Sicily had been secured, Eighth Army moved to the invasion of mainland Italy, crossing the Strait of Messina to land around Reggio di Calabria on 3 September (Operation Baytown).

From Reggio, 98th (S&SY) Fd Rgt moved to Taranto where in October it embarked in Landing Ships, Tank for a four-day voyage round the 'heel' of Italy to Manfredonia, from where it advanced to Foggia.

[97] The opening of the 1944 Allied spring offensive in Italy saw 98th (S&SY) Fd Rgt assigned to 8th Indian Division to force a crossing of the River Gari as part of Operation Diadem.

The field guns concentrated on the Nebelwerfer mortar positions and then provided a creeping barrage for the infantry advancing at a rate of 100 yards (91 m) in six minutes.

The leading battalions of 8th Indian Division crossed without much difficulty, covered by mist in the river valley, but aroused by the preliminary bombardment the Germans brought down their pre-arranged defensive fire.

[3][64][72] The 144th Field Regiment remained in the United Kingdom in the early war years as part of Home Forces, attached to 4th Division after its return from the Dunkirk evacuation.

[4][5][102] The original Surrey Yeomanry wore a light blue uniform with silver braid and buttons, and a large scarlet plume in the Tarleton helmet.

[2][103] Following the South African War yeomanry regiments were encouraged to discard their expensive and colourful 19th century uniforms in favour of the newly introduced khaki service dress of 1902.

[64] The following served as Honorary Colonel of the unit:[16][107] There is a small collection of items associated with the Surrey and Sussex Yeomanry hosted at Newhaven Fort.