[7] The Treaty of Amiens in 1802 saw most of the Yeomanry disbanded, leaving six troops in Sussex (Petworth, West Hoathly, Midhurst, Lewes, Parham and Chichester).

However, a new Goodwood Troop of Yeomanry Artillery was raised on 19 October 1817 by Charles Gordon-Lennox, Earl of March and Darnley (later 5th Duke of Richmond).

[2][7][11] Following a string of defeats during Black Week in early December 1899, the British government realised that it would need more troops than just the regular army to fight the Second Boer War.

[23][30][28][29] The Sussex Yeomanry were mobilised on the outbreak of war on 4 August 1914 under the Charles Gordon-Lennox, Earl of March, DSO, who had only taken command on 3 July.

On 15 August 1914, the War Office issued instructions to separate those men who had signed up for Home Service only, and form these into reserve units.

[28][39] The brigade served as part of the Suez Canal Defences from 14 March to 26 July attached to 42nd (East Lancashire) Division;[28][39] it then joined the Western Frontier Force.

In 1924 it was redesignated 98th (Surrey and Sussex Yeomanry, Queen Mary's) Army Field Brigade, Royal Artillery, and the Regimental Headquarters moved from Brighton to Clapham Park.

In May 1940, it would be attached in turn to the 46th and 44th Infantry Divisions during the German advance the regiments Guns and vehicles were caught in a traffic jam and had to be destroyed, with the troops proceeding on foot to Dunkirk for evacuation.

[55] Back in the United Kingdom the regiment was attached to the 1st Infantry Brigade while it reformed it remained in the United Kingdom until September 1942 when it was sent out to the Middle East and attached to the 10th Armoured Division in Egypt where it participated in the Second Battle of El Alamein, when 10th Armoured was disbanded the regiment was part of the 8th Army Artillery and served in Sicily and Italy being involved in the Battle of Monte Cassino amongst others before leaving Italy in March 1945 and joining the 2nd Army in France and Belgium ending the war in the Netherlands.

It was equipped with 12 × 4.5-inch howitzers of First World War vintage, but within days it had handed over eight of these guns to 123 Officer Cadet Training Unit at Catterick Garrison and all its vehicles to 98th (S&SY) Fd Rgt, which was preparing to go to France with the British Expeditionary Force (BEF).

[56] In April 1940, 144th Fd Rgt went to Dursley in Gloucestershire to join IV Corps, and began to receive modern 25-pounder guns and Quad tractors.

By June, when the BEF had been evacuated from Dunkirk without any of its guns, 144th Fd Rgt was one of the few field regiments in the UK with its full allotment of 24 × 25-pounders.

By 1 February, the advance was continuing at high speed, the guns driving at 35 mph until they were stopped by artillery fire 1 mile (1.6 km) short of Ponte Mussolini on the Barka River.

On 3 February, the battery reached the main Italian defensive position at Dongolass Gorge that shut off the Keren Plateau and began shelling the defences.

On 10 February, the 4/6th Rapjputana Rifles (the 'Rajrifs') made another assault on the Acqua Col, Major Mansergh and his party going up with the battalion HQ.

All the artillery of two divisions was concentrated against Mount Sanchil on 16 March, and the OP on Cameron Ridge was able to bring down F Trp's fire on enemy reinforcements massing for a counter-attack.

On 18 March the OP reported that the enemy had recaptured Sanchil, and at 05.15 the next morning the Alpini battalion of the Savoia Grenadiers was seen running down the gorge, until an effective Defensive Fire (DF) task was called down on them.

Munn accompanied 2nd Bn Highland Light Infantry and was wounded, while his signaller won a Military Medal for laying out a telephone line under fire when the radio failed.

The following day, Major Munn accompanied 1st Bn Worcestershire Regiment as they took Middle Hill supported by a powerful artillery attack.

[85][86] After hard fighting, covered by 144th Fd Rgt, 70th Division broke through and XIII Corps' HQ entered the town on 29 November.

Fighting continued: on 30 November, the regiment halted an enemy infantry counter-attack with a DF programme, though one gun of D Trp was knocked out by a direct hit.

[53][63] Royal Artillery field regiments had adopted a three-battery organisation earlier in the war, and 144th Fd Rgt finally reorganised its 24 guns into three batteries (389, 390 and 552) in January 1943.

[49][53][63] 144th (Surrey & Sussex Yeomanry QMR) Field Regiment was placed in suspended animation at Almaza, Egypt, on 21 September 1945.

[49][53][50] The cadre that provided the basis for 74th Medium Regiment was supplied by 144th (S&SY) Fd Rgt, but it was considered a war-formed unit, not part of the TA, and was not granted the Yeomanry subtitle.

[95][96] The regiment was formed too late for the Battle of France, but by the end of 1940 it was serving in XII Corps of Home Forces, stationed in the critical invasion area of South-East England.

[112][113] 2nd AGRA was part of a large concentration of artillery supporting Eighth Army in the Spring 1945 offensive in Italy (Operation Grapeshot).

[2] The several units that made up the Sussex Troops of Gentlemen and Yeomanry in 1794, favoured light cavalry helmets with feather plumes, short dark green jackets with black facings and white breeches.

[4][5][122] The newly formed Regiment of Sussex Imperial Yeomanry of 1901 wore khaki for both full and service dress, but in both orders with "Dublin Fusiliers Blue" (a bright shade) for cuffs, collars and trouser stripes.

The headdress for all ranks was a Boer War influenced slouch hat of light drab with bright blue emu feather plumes.

[50] The following served as Honorary Colonel of the unit:[21][33] A brass plaque commemorating eight members of 69th (Sussex) Company IY who died during the Second Boer War is on the west wall of St Mary the Virgin Church at Battle.