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In page 172nd (2/1st South Lancashire) Brigade:

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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]