The outbreak of war on 4 August saw 4th London Brigade at
Perham Down on
Salisbury Plain, where it had just arrived for its annual training camp with the rest of 2nd London Division. They were immediately recalled to London to complete their mobilisation and by mid-August 4 London Bde had reached its war station round
St Albans,
Hertfordshire. The County of London Territorial Force Association immediately began raising '2nd Line' battalions, which quickly led to the formation of a duplicate 2/4th London Brigade (eventually
179th Brigade); consequently 4th London Brigade became 1/4th and its battalions similarly renumbered (1/13th–1/16th).
Order of Battle Several of the London battalions were politically well-connected These battalions were replaced by others from
2nd London Bde of
1st London Division, which had been temporarily broken up. The following units served in 140 Bde: •
1/6th (City of London) Battalion, The London Regiment (City of London Rifles) joined 5 November 1914; sent drafts to 1/15th and 1/17th Londons on 30 January, and cadre left to merge with 2/6th Londons in
58th (2/1st London) Division on 2 February 1918. •
1/7th (City of London) Battalion, The London Regiment joined 5 November 1914; sent a draft to 1/19th Londons in
141st (5th London) Brigade on 29 January, and cadre left to merge with 2/7th Londons in 58th Division on 2 February 1918. •
1/8th (City of London) Battalion, The London Regiment (Post Office Rifles) joined 6 November 1914; sent a draft to 1/17th Londons and cadre left to merge with 2/8th Londons in 58th Division on 2 February 1918. • 1/15th (County of London) Battalion, The London Regiment (Civil Service Rifles) • 140th Light Trench Mortar Battery formed June 1915. • 2nd London Company ASC became 456th (Horse Transport) Company ASC August 1915. •
1/4th (City of London) Bn London Regiment (Royal Fusiliers) joined 15 November 1915; transferred to
168th (2nd London) Brigade in 56th (1st London) Division on 9 February 1916. • 1/17th (County of London) Battalion, The London Regiment (Poplar and Stepney Rifles) joined from 141st (5th London) Bde 1 February 1918. •
1/21st (County of London) Battalion, The London Regiment (1st Surrey Rifles) joined from
142nd (6th London) Brigade 1 February 1918. • 140th Machine Gun Company formed December 1915; merged into 47th Battalion
Machine Gun Corps March 1918. The 1/15th Londons (Civil Service Rifles) was the only prewar battalion of the brigade to serve with it throughout the war.
Service In October 1914, 2nd London Division was selected for service on the
Western Front and progressive training was carried out through the winter. The division embarked for France in March 1915, concentrating round
Béthune. In May the division (already known in France simply as 'The London Division' to distinguish it from the Regular Army
2nd Division) took its place in the line and was designated
47th (1/2nd London) Division, with the brigades numbered consecutively: 4th London became
140th (1/4th London) Brigade.
Actions During the war, the brigade was engaged in the following operations:
1915 •
Battle of Aubers Ridge 9 May •
Battle of Festubert 15–25 May •
Battle of Loos 25 September–1 October •
Battle of the Hohenzollern Redoubt 13–19 October
1916 • Vimy Ridge 21 May •
Battle of the Somme: •
Battle of Flers-Courcelette 15–19 September • Capture of
High Wood 15 September •
Battle of the Transloy Ridges 1–9 October • Capture of Eaucourt l'Abbaye 1–3 October • Attacks on the
Butte de Warlencourt 7–8 October
1917 •
Battle of Messines 7–13 June •
3rd Battle of Ypres: •
Battle of Pilckem Ridge] (in reserve) 31 July–2 August) • In the line 18 August–2 September and 8–17 September •
Battle of Cambrai: • Capture of Bourlon Wood 28 November • German counter-attacks 30 November–3 December Early in 1918 the brigade was completely reorganised (
see Order of Battle above)
1918 •
1st Battles of the Somme: • Battle of St Quentin 21–23 March • 1st Battle of Bapaume 24–25 March • Battle of the Ancre 5 April •
2nd Battles of the Somme: •
Battle of Albert 22–23 August •
2nd Battle of Bapaume 31 August–3 September •
Final Advance in Artois: • Operations in Artois 2 October–11 November • Official Entry into Lille 28 October After the
Armistice, 47th Division was engaged in railway repair and then settled down around Bethune to await demobilisation. This began in January, and the last troops left France on 10 May 1919. The brigade was demobilised at
Felixstowe in May–June 1919. ==Interwar years==