XV Brigade , Royal Horse Artillery XV Brigade , Royal Horse Artillery was a brigade of the Royal Horse Artillery formed during World War I . It served with 29th Division in the Gallipoli Campaign and on the Western Front . It was disbanded after the war . Duplicate numbering . Strangely , two Royal Horse Artillery brigades were formed early in World War I and simultaneously designated as XV Brigade , RHA . The first was formed on 1 October 1914 for service with the 3rd Cavalry Division and commanded C , G and K Batteries , RHA . It was renumbered as IV Brigade , RHA in May 1915 . The second was formed in January 1915 and is the subject of the current article . Formation . XV Brigade , RHA was formed at Leamington , Warwickshire in January 1915 with : On formation , the batteries were re - equipped with four 18 pounder s each . The brigade was assigned to the 29th Division . In March 1915 , it embarked at Avonmouth and sailed for Alexandria ( via Malta ) arriving from 28 March . On 7 April , the division began re - embarking at Alexandria and sailed for Gallipoli . Gallipoli . The division started landing at Cape Helles from 7am on 25 April and served on the Gallipoli Peninsula until January 1915 . While at Helles , the division saw action at the Capture of Sedd el Bahr ( 26 April ) , the First ( 28 April ) , Second ( 6 – 8 May ) and Third Battles of Krithia ( 4 June ) , the Battle of Gully Ravine ( 28 June – 2 July ) and the Battle of Krithia Vineyard ( 6 – 13 August ) . From 16 August to the night of 19 / 20 December 1915 , the bulk of the division served at Suvla but the brigade remained at Helles . On the night of 7 / 8 January 1916 , the division was evacuated from Helles . The division moved to Egypt were it was concentrated at Suez . In March 1916 , it was transferred to France , landing at Marseille and reaching the Somme area ( near Pont - Remy ) between 15 and 29 March . On 31 March , 369th Battery , RFA arrived from England and joined the brigade ; it left for 132nd Brigade , RFA ( 29th Division ) on 20 May . The brigade remained on the Western Front for the rest of the war . Western Front . The first action on the Western Front was the Battle of the Somme . On 1 July 1916 , the brigade took part in the Battle of Albert as part of VIII Corps , Fourth Army . On 12 September 1916 , the brigade was reorganized . 132nd Brigade , RFA was broken up and its three batteries were used to make up XV Brigade , RHA and 17th Brigade , RFA to six 18 pounder s each . At the same time , 460th ( H ) Battery , RFA ( four 4 . 5 " howitzers ) joined the brigade from 17th Brigade , RFA . It was made up to six howitzers on 19 January 1917 . The final change in organization occurred on 27 November 1916 when Y Battery was transferred to the 1st Cavalry Division and 1 / 1st Warwickshire Battery , RHA ( TF ) was received in exchange . In 1917 , the brigade supported the division in a large number of major actions including the Battle of Arras ( April to May , First , Second and Third Battles of the Scarpe ) , the Third Battle of Ypres ( August to October , battles of Langemarck , Brodseinde and Poelcappelle ) and the Battle of Cambrai ( November and December , including the Tank Attack and the German Counter - attacks ) . 1918 likewise saw a number of major actions , including the Battle of the Lys ( April , the battles of Estaires , Messines , Hazelbrouck and Bailleul ) , the Advance to Victory ( August and September ) and the Final Advance in Flanders ( September and October , Fifth Battle of Ypres and Battle of Courtrai ) . At the Armistice , it was still serving with 29th Division with B Battery RHA , L Battery RHA , 1 / 1st Warwickshire Battery RHA ( TF ) and 460th ( H ) Battery RFA ( eighteen 18 pounders and six 4 . 5 " howitzers ) . Dissolved . Still with 29th Division , the brigade advanced into Germany to take part in the Occupation of the Rhineland . It left 29th Division in December 1918 and returned to England from Germany in April 1919 . The brigade was disbanded at this time . 460th ( H ) Battery was disbanded , 1 / 1st Warwickshire Battery , RHA ( TF ) was disembodied , B Battery joined I Brigade , RHA and L Battery joined VII Brigade , RHA , both in the United Kingdom .