The 2nd Line regiment was formed in 1914. Early in 1915 it joined the &lt;a href="2/1st%20South%20Wales%20Mounted%20Brigade"&gt;2/1st South Wales Mounted Brigade&lt;/a&gt; at Carmarthen and later moved to Llandilo and Dorchester. In September 1915, it moved with the brigade to the Yoxford area and joined the 1st Mounted Division. On 31 March 1916, the remaining Mounted Brigades were ordered to be numbered in a single sequence and the brigade became 4th Mounted Brigade. The regiment was based at Southwold during the raid by Admiral Boedicker's battle cruisers on Lowestoft in 1916.