The 1st London Division mobilised on the outbreak of World War I in August 1914, and the 1st London Brigade, with No 2 Signal Section, was sent on 4 September to relieve the Regular Army garrison of Malta. The rest of the division's infantry and artillery was progressively sent to France to reinforce the Regulars of the British Expeditionary Force. In February 1915 HQ and No 1 Section of the Signal Company were assigned to 29th Division, newly formed from Regular units brought back from colonial garrisons. On 25 April the division landed at Cape Helles on the Gallipoli Peninsula, and it served through the Gallipoli Campaign until the final evacuation in January 1916. It was then transferred to the Western Front, where it attacked Beaumont-Hamel on the First day on the Somme and then served through the battles of Arras, Third Ypres and Cambrai in 1917 and the German spring offensive and Allied Hundred Days Offensive in 1918. After the Armistice the division was sent into Germany as part of the British Army of the Rhine. Following demobilisation of remaining Territorial Force elements, the signal company was converted into Southern Division Signals in Germany in November 1919. A Regular unit, this continued until the division disbanded in 1923