145th Infantry Brigade (United Kingdom)

South Midland Brigade 145th (South Midland) Brigade 145th Infantry Brigade 145th (South) Brigade
Insignia of 145 (South) Brigade
Active	1908–1919 1920–1943 1995–2014
Country	United Kingdom
Branch	British Army
Type	Territorial Army Regular and Army Reserve
Size	Brigade
Part of	Support Command
Garrison/HQ	Aldershot Garrison
Insignia
Identification symbol	Roebuck

The 145th Infantry Brigade was a regional brigade of the British Army that saw active service in both World War I and World War II, disbanding in 1943 and being reformed in the 1990s. The Brigade was renamed Headquarters 11th Infantry Brigade and Headquarters South East in October 2014.

The South Midland Brigade was first formed on the creation of the Territorial Force in 1908 by the amalgamation of the Volunteer Force and the Yeomanry. The South Midland Brigade was composed of four Volunteer battalions: the 5th Battalion, Gloucestershire Regiment, the 4th Battalion, Oxfordshire and Buckinghamshire Light Infantry and the Buckinghamshire Battalion, Ox and Bucks and the 4th Battalion, (Princess Charlotte of Wales's) Royal Berkshire Regiment. The brigade was assigned to the South Midland Division, which was one of fourteen divisions of the peacetime Territorials.

The division was mobilised on 4 August 1914, the day after the outbreak of the First World War. Most of the men of the division volunteered for overseas service and the ones who didn't were formed into 2nd Line units, the 2nd South Midland Brigade, part of the 2nd South Midland Division.

The brigade was numbered as the 145th (South Midland) Brigade (along with the 143rd (Warwickshire) Brigade and 144th (Gloucester and Worcester) Brigade) in the 48th (South Midland) Division. The battalions, like all other TF battalions, were redesignated with the '1/' prefix (1/4th Ox and Bucks, for example) to distinguish them from the 2nd Line units, formed of those men who did not originally volunteer to serve overseas, who were designated with the '2/', and were later numbered 184th (2/1st South Midland) Brigade, 61st (2nd South Midland) Division.