It saw active service during the First World War on the Western Front in 1917 and 1918 as part of an Army Field Artillery Brigade.

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

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

[6] The 1st Line battery was embodied with the Welsh Border Mounted Brigade on 4 August 1914 at the outbreak of the First World War and moved to East Anglia.

In March 1916, the Welsh Border Mounted Brigade (without the battery) was dismounted and left for Egypt.

[6] The battery joined the 2nd line 2/1st Welsh Border Mounted Brigade on formation in September 1914.

[11] The battery (along with 2/1st Berkshire RHA) joined CLVIII Brigade, RFA when it was reformed[c] at Heytesbury, Wiltshire on 13 April 1917.

[31] Shropshire RHA was reconstituted in the Territorial Force on 7 February 1920 when it formed a battery (later numbered 240th) in 6th (Cheshire and Shropshire) Medium Brigade, Royal Garrison Artillery and ceased to be a Royal Horse Artillery battery.

[34] When it was reformed in the postwar TA as 351st (Midland) Medium Rgt, the Shropshire RHA element instead joined 639th Heavy Regiment as P Battery, later becoming HQ RA of 48th District.