| Unit Name: | 172nd (2/1st South Lancashire) Brigade |
| Dates: | January 1915–July 1919 November 1943–April 1944 |
| Country: |  United Kingdom |
| Branch: | British Army |
| Type: | Infantry Brigade |
| Role: | Infantry and deception |
| Command Structure: | 57th (2nd West Lancashire) Division |
172nd (2/1st South Lancashire) Brigade was a 2nd-Line infantry formation of the British Territorial Force raised during the First World War that served on the Western Front. The brigade's number was also used for deception purposes during the Second World War.
On 31 August 1914 the War Office authorised the formation of a reserve or 2nd-Line unit for each Territorial Force (TF) unit that was proceeding on overseas service. The 2nd/1st South Lancashirel Brigade came into existence in November 1914, composed of 2nd-Line duplicates of the battalions of the peacetime South Lancashire Brigade that were due to be sent overseas. The brigade was part of 2nd West Lancashire Division. In August 1915 these formations were assigned numbers, becoming 172nd (2nd/1st South Lancashire) Brigade and 57th (2nd West Lancashire) Division respectively.[1] [2]
The following units served in the brigade during the war:[1] [2] [3]
The following officers commanded the brigade during the war:[1]
The formations and units of 57th Division concentrated around Canterbury in early 1915 as part of Second Army, Central Force. Training was hampered by lack of equipment: the infantry trained on obsolete .256-inch Japanese rifles until .303-inch service rifles (many in poor condition) arrived in November 1915. In July 1916, 57th Division was transferred to the Emergency Reserves in the Aldershot area where it continued training.[1] [2] 172 Brigade was initially at Mytchett and later at Blackdown.[1] [6]
On 5 January 1917 the division was ready for overseas service, and between 7 and 22 February its units and formations crossed to France and disembarked at Le Havre. On 25 February it took over a section of the Front Line under the command of II ANZAC Corps. 172 Brigade served on the Western Front for the rest of the war, taking part in the following operations:[1]
On 1 November 1918 172 Bde went into billets at Lille, and was still resting when the Armistice with Germany was signed. For the rest of 1918 its units were involved in clearing and evacuating stores from the Arras area. Demobilisation began in January 1919 and units were steadily reduced to cadres. The last cadres of 57th Division left France in July 1919, completing the disbandment of 172 Bde.[1]
172 Brigade was never reformed, but the number was used for deception purposes during the Second World War. During November and December 1943, 30th Battalion Green Howards, a line of communication unit serving in 42nd Brigade in North Africa and composed mainly of men below Medical Category 'A', was redesignated '172nd Infantry Brigade' and acted as if it were a full brigade. It was succeeded in this role by 30th Battalion Bedfordshire and Hertfordshire Regiment from December 1943 until June 1944.[9]