It served with 1st Cavalry Division throughout World War I and was reorganized post-war before being dissolved.

Henceforth, batteries were designated in a single alphabetical sequence in order of seniority from date of formation.

[12] In practice, the batteries were permanently assigned to the cavalry brigades from September 1914 onwards.

[13] Its first action was the Battle of Mons on 23 and 24 August where the division formed the left flank.

[13] The only action in 1916 was at the Battle of Flers-Courcelette (15 September) when the division was in reserve to XIV Corps of Fourth Army.

[19] At the Armistice, it was still serving with 1st Cavalry Division with H, I and Y Batteries RHA (eighteen 13 pounders).

[22] By October 1919, VII Brigade, RHA was reformed in the United Kingdom with[22] This new incarnation was short-lived, however.

[22] Post-World War II plans for the Royal Horse Artillery envisioned a 7th Regiment, RHA.

Initially formed in the British Army of the Rhine in October 1946, the decision was rescinded in March 1947 before the regiment was fully constituted.