On the outbreak of the
First World War, the men of the division accepted liability for overseas service to relieve Regular troops for the fighting fronts. The 7th and 8th Middlesex sailed for Gibraltar on 4 and 10 September 1914. The rest of the division was ordered to
India, although the brigade staffs and Regular adjutants of the battalions were to remain behind. To replace 7th and 8th Middlesex, the 4th Battalion,
Border Regiment and 4th Battalion,
King's Shropshire Light Infantry were added to the Middlesex Brigade, and the 1st Brecknockshire Battalion of the
South Wales Borderers also sailed with the brigade. The Home Counties Division embarked at Southampton and sailed on 30 October 1914, disembarking at Bombay on 1–3 December.
Service in India On arrival, the division's units were sent distributed to various peacetime stations across India,
Aden and
Burma to continue their training for war. The Border and KSLI battalions joined the
Burma Division, the Brecon battalion went to Aden, and for a while the two Middlesex battalions were attached to the Presidency Brigade in
8th (Lucknow) Division. The TF battalions had all taken the prefix '1' (1/4th Queen's
etc) to distinguish them from their 2nd Line battalions forming in the United Kingdom. In March 1915, 2/4th Border Regiment was sent out to the brigade to replace 4th KSLI, which had moved from Burma to
Singapore.
Order of Battle During the First World War the Middlesex Brigade was composed as follows: Commander:
Brigadier-General W.R. Clifford (remained in England) • 7th Battalion, Middlesex Regiment
(from Hornsey) – to Gibraltar • 8th Battalion, Middlesex Regiment
(from Hounslow) – to Gibraltar • 4th Battalion,
King's (Shropshire Light Infantry) (from Shrewsbury) – to Burma • 1st Brecknockshire Battalion,
South Wales Borderers (from Brecon) – to Aden == Between the wars ==