However, on the outbreak of war on 4 August 1914, many members volunteered for Imperial Service.

Therefore, TF units were split in August and September 1914 into 1st Line (liable for overseas service) and 2nd Line (home service for those unable or unwilling to serve overseas) units.

[2] In May 1916, 2/B Battery, Honourable Artillery Company (four Ordnance BLC 15-pounders) moved to Cupar where it joined the brigade.

[3] 2/B Battery, HAC left on 10 May 1917 and proceeded to Heytesbury, Wiltshire where it joined the reformed CXXVI Brigade, RFA.

[12] By January 1918, 10th Cyclist Brigade had moved to Lincolnshire with the 2/1st Duke of Lancaster's at Alford and Skegness,[13] the 2/1st Westmoreland and Cumberland at Spilsby and Burgh-le-Marsh,[14] and the 2/1st Lancashire Hussars also at Skegness.