A second line battery, 2/1st Hampshire RHA, served on the Western Front in 1917 and 1918 as part of an Army Field Artillery Brigade.

[2] On 18 March 1908, Wiltshire Royal Horse Artillery (Territorial Force) was proposed to be raised as a new unit.

However, poor recruiting led to a change in plans and the Hampshire Royal Horse Artillery (Territorial Force) was raised instead.

[3] It was the last Territorial Force Royal Horse Artillery unit to be raised and it was recognized by the Army Council on 10 September 1909.

2nd Line units performed the home defence role, although in fact most of these were also posted abroad in due course.

[7] The 1st Line battery was embodied with the 1st South Western Mounted Brigade on 4 August 1914 at the outbreak of the First World War.

Initially assigned to the Portsmouth Defences in August 1914,[9] the brigade moved to the Forest Row area of Sussex in October 1914.

[10] The battery, along with the Essex and West Riding RHA, joined V Lowland Brigade, Royal Field Artillery (T.F.)

[18][b] The Hampshire Battery (with XX Brigade, RHA) joined the Yeomanry Mounted Division at Khan Yunis on 5 July.

[22] Once the division was restructured and renamed, it served with the DMC for the rest of the war, taking part in the Second Transjordan Raid (30 April to 4 May 1918) and the Final Offensive, in particular the Battle of Megiddo (19 to 25 September) and the Capture of Damascus (1 October).

[7] The pre-war Territorial Force infantry divisions were generally[e] supported by four field artillery brigades.

[28][g] On 17 February 1917, the division started moving overseas and by 3 March had completed its concentration at Méricourt in France.