Since October 1914 the RMA had been re-organised in order to provide two artillery brigades for use on the Western Front. One unit fitted out at Eastney in December 1914 the role of an anti-aircraft brigade. It was fully mobile and equipped with 2pdr pom-pom guns, customised with special sights. There were four guns to a battery, each mounted on an armoured lorry; in all four batteries were formed. The first two reached the Western front in April 1915, to be joined there by the second pair in the autumn. The batteries mainly operated along the coast from Nieuport to Dunkirk and also in the Ypres salient. Eventually the role was taken over by the Army, but one battery remained a RM unit, June l918; a second RM battery was formed following the German air raids on London.