When the Volunteer Force was subsumed into the new Territorial Force under the Haldane Reforms in 1908, the 1st and 2nd Lothian Volunteer Infantry Brigades became the Lothian Brigade. It was not included in the Lowland Division with the rest of the TF units from Southern Scotland, but formed an independent brigade in Scottish Coastal Defences.
Mobilisation
On the outbreak of war on 4 August 1914, the Lothian Brigade of the Territorial Force mobilised at Edinburgh under Brigadier-General H.F. Kays as part of Scottish Coastal Defences, with the following units under command:
Almost immediately, TF units were authorised to raise 2nd battalions formed from those men who had not volunteered for, or were not fit for, overseas service, together with new volunteers. A 2nd Lothian Brigade was formed from these units, but the two brigades merged again as the 1st Line battalions progressively went overseas in late 1914 and early 1915 to reinforce Regular Army formations or join the 52nd Infantry Division. Other units were also posted to the Lothian Brigade for short periods in early 1915, including Special Reserve battalions:
Early in 1915 the 2nd Line TF battalions were raised to full strength to form 2nd Line divisions such as the 65th Division, and began to form Reserve units. Once again the remaining Home Service men were separated out in May 1915 to form Coast Defence Battalions. The Special Reserve battalions of the Lothian Brigade were split off into a separate Special Reserve Brigade and the Lothian Brigade was first retitled Scottish Provisional Brigade and then 1st Provisional Brigade. The composition of 1st Provisional Brigade was then as follows:
In April 1916, 1st Provisional Brigade moved by train from Edinburgh, first to the Bishops Stortford area, the on 25 April to the East Kent coast on 25 April. Brigadier-General A.G. Duff took over from Brig.-Gen. Kay, and the brigade came under the orders of 67th Division in Southern Army. The brigade was now billeted as follows:
The Military Service Act 1916 swept away the Home/Foreign service distinction, and all TF soldiers became liable for overseas service, if medically fit. The Provisional Brigades thus became anomalous, and at the end of 1916 the remaining battalions were formed into numbered battalions of their parent units in new Mixed Brigades and Home Service Divisions. Part of their role was physical conditioning to render men fit for drafting overseas, alongside units of the Training Reserve. 1st Provisional Brigade became 221st Infantry Brigade, with its subunits redesignated as follows:
The brigade remained guarding the Kent coast throughout 1917, occasionally enduring bombing attacks from German Zeppelins and aircraft. Brigadier-General J. Marriott took over command in May 1917. On 25 October 1917 the title of the formation was changed to 221st Mixed Brigade. On 12 February the brigade was transferred from the command of 67th Division in Southern Army to the Cyclist Division under Eastern Command, with only minor changes in deployment. In May 1918 each of the Mixed Brigades was called upon to provide a battalion to reconstitute the 59th Division, which had been virtually destroyed during the German Spring Offensive. 221st Mixed Brigade supplied 11th Royal Scots Fusiliers to 178th Brigade and immediately raised a new 13th Battalion RSF to take over its coast defence duties. With the war coming to an end, the brigade received orders for disbandment on 7 November 1918. The battalions dispersed in the following March and April and Brigade HQ closed on 11 April 1919.
