[2] Captain Robert Bull was appointed to command and he took it to the Iberian Peninsula in August 1809 where it served until 1814.

It arrived too late for the Battle of Talavera, but thereafter took part in most of Wellington's major actions of the Peninsular War including Bussaco (1810), Fuentes de Oñoro (1811), Ciudad Rodrigo, Badajoz, Salamanca, and Burgos (1812), Vitoria, San Sebastián, the Bidassoa and the Nive (1813) and Bayonne (1814).

[3] Its most famous[2][3] action during the Peninsular War occurred at the Battle of Fuentes de Oñoro on 5 May 1811 when it was temporarily under the command of Lieutenant Norman Ramsay.

With the guns limbered up and swords drawn, they charged through the surprised enemy horsemen thereby saving themselves from being captured.

Firing shrapnel over the heads of friendly troops, in 10 minutes it cleared a nearby wood of French tirailleurs, much to the satisfaction of Wellington and Frazer (commander of the horse artillery).

[3] In commemoration of its performance in the Peninsular War and at the Battle of Waterloo, the Honour Title "Bull's Troop" was officially granted to the battery on 13 October 1926.

The troop was not one of the three sent to take part in the Crimean War,[12][c] nor one of the three dispatched to India in 1858 to assist in the final operations to quell the Indian Rebellion of 1857.

[30] On mobilization, it joined The Cavalry Division and served with it on the Western Front for the rest of the war.

[35] E Subsection[h] was the first British gun to enter Germany, crossing the frontier at Poteau (between St. Vith and Malmedy and now in the Belgian province of Liège) at 9am on 1 December 1918.

[41] Mechanisation of the RHA began in 1934 and by 1936 the battery – now at Risalpur – had been given a mix of equipment: two sections[h] had 18 pounders and one had 3.7" Howitzers towed by Light Dragon gun tractors.

[42] In October 1936, the battery returned to the United Kingdom where it joined II Brigade, RHA at Newport.

[46] Initially part of the 1st Armoured Division in the United Kingdom, in October 1939 it moved to France, where the regiment was placed under direct command of General Headquarters, BEF.

[53] From 21 April 1942, it served with 22nd Guards Brigade under command of 2nd South African Division in the Battle of Gazala.

[54] On 25 June, it transferred to 22nd Armoured Brigade and took part in the Battle of Mersa Matruh and the Defence of the El Alamein Line.

[56] The regiment left 1st Armoured Division on 26 September 1944 and came under direct command of Headquarters, Allied Armies in Italy where it remained until the end of the war.

[57] Post-war, the battery remained part of the 2nd RHA, equipped with Sexton 25 pounder self-propelled guns.

[60] Initially equipped with the 105 mm Pack Howitzer, in 1974 the battery (and regiment) was re-armed with the L118 light gun.

[61] Other than a period from 1977 to 1984 when the battery (and the regiment) was rerolled as a field artillery unit and posted to the BAOR in Germany, it has been based in England, initially at Aldershot but latterly at Colchester.