| Unit Name: | IX Brigade, RHA |
| Dates: | 1 March 1901 – February 1915 October 1919 – 4 May 1920 |
| Type: | Artillery |
| Size: | Battalion |
IX Brigade, Royal Horse Artillery was a brigade of the Royal Horse Artillery which existed in the early part of the 20th century. It was dissolved at the outbreak of World War I as its constituent batteries were posted to other formations. It was briefly resurrected post-war before being dissolved once again.
Royal Horse Artillery brigades did not exist as an organizational or operational grouping of batteries until 1 July 1859 when the Horse Brigade, Royal Artillery was formed. The brigade system was extended to five (later six) brigades when the horse artillery of the Honourable East India Company had been transferred to the British Army in 1861. These brigades were reduced to five in 1871, then to three (of 10 batteries each) in 1877 and to two (of 13 batteries each) in 1882. The brigade system was finally abolished in 1889.
As battery designations were tied to the brigade that the battery was assigned to, batteries were redesignated in a bewildering sequence as they were transferred between brigades. For example, E Battery of C Brigade (E/C Bty) might become N Battery of A Brigade (N/A Bty) upon transfer. Henceforth, batteries were designated in a single alphabetical sequence in order of seniority from date of formation.
The brigade system was revived in 1901. Each brigade now commanded just two batteries and a small staff (a Lieutenant-Colonel in command, an adjutant and a brigade sergeant major). Initially, batteries were not assigned to brigades in any particular order, but in 1906, at the insistence of Edward VII, brigades were redesignated so that batteries were roughly in order of seniority (hence I Brigade commanded A Battery and B Battery).
IX Brigade, RHA was formed on 1 March 1901 as I Brigade-Division, RHA with N Battery and S Battery. In 1903 it was redesignated as I Brigade, RHA and was stationed at Aldershot. On 1 October 1906, it was redesignated as IX Brigade, RHA.
By the time World War I broke out, the brigade was in Secunderabad, India assigned to 9th (Secunderabad) Division. N Battery was at Secunderabad and on mobilization was assigned to the newly formed II Indian Brigade, RHA with 2nd Indian Cavalry Division (attached to 9th (Secunderabad) Cavalry Brigade) and sailed for the Western Front in November 1914. S Battery was at Bangalore and remained with the 9th (Secunderabad) Division until February 1915 when it departed for Mesopotamia. There it joined the 6th Indian Cavalry Brigade on formation on 21 February. With the departure of its batteries, the brigade HQ was dissolved in February 1915.
By October 1919, IX Brigade, RHA was reformed in the United Kingdom with
This new incarnation was short-lived, however. On 4 May 1920 the brigade was broken up. N Battery moved to St John's Wood and joined IV Brigade, RHA, S and U Batteries was redesignated as 144th and 143rd Batteries, RFA and joined 15th Brigade Royal Field Artillery and T Battery was redesignated as 146th Battery, RFA and joined 1st Brigade Royal Field Artillery.