# British Army First World War reserve brigades

The article lists British Army reserve brigades in World War I. At the start of the war volunteers in the vast majority of cases joined their local infantry regiment's reserve battalion. As the army expanded rapidly, further reserve battalions and brigades were formed. After conscription was introduced in 1916 the existing regimental system could not cope with the large influx of recruits and the existing reserve brigades were incorporated into the Training Reserve, with an official complement of over 209,000 soldiers, in addition to the regimental training units.

## Recruitment

On 6 August 1914, less than 48 hours after Britain's declaration of war, Parliament sanctioned an increase of 500,000 men for the Regular British Army, and the newly-appointed Secretary of State for War, Earl Kitchener of Khartoum issued his famous call to arms: 'Your King and Country Need You', urging the first 100,000 volunteers to come forward. This group of six divisions with supporting arms became known as Kitchener's First New Army, or 'K1'. 'K2' and 'K3', followed shortly afterwards. In addition, recruits flooded into the drill halls of the part-time Territorial Force (TF), which had largely volunteered for overseas service. The flood of volunteers overwhelmed the ability of the army to absorb and organise them, and by the time the Fifth New Army ('K5') was authorised on 10 December 1914, many of the units were being organised as 'Pals battalions' under the auspices of mayors and corporations of towns up and down the country. Many of these pals who had lived and worked together, joined up and trained together and were allocated to the same units. The policy of drawing recruits from amongst the local population ensured that, when the Pals battalions suffered casualties, whole towns, villages, neighbourhoods and communities back in Britain were to suffer disproportionate losses.
By the end of August 1914, 300,000 men had signed up to fight, and another 450,000 had joined up by the end of September. Voluntary recruitment remained fairly steady through 1914 and early 1915, but it fell dramatically thereafter. Conscription for single men was introduced in January 1916. Four months later, in May 1916, it was extended to all men aged 18 to 41. The Military Service Act March 1916 specified that men from the ages of 18 to 41 were liable to be called up for service in the army, unless they were married (or widowed with children), or served in one of a number of reserved occupations, which were usually industrial but which also included clergymen and teachers. This legislation did not apply to Ireland, despite its then status as part of the United Kingdom (but see Conscription Crisis of 1918). By January 1916, when conscription was introduced, 2.6 million men had volunteered for service, a further 2.3 million were conscripted before the end of the war; by the end of 1918, the army had reached its peak strength of 4 million men.

## Training

Before the war British Army infantry regiments trained their recruits at their home depots from where they were drafted to one of their regiment's Regular Army battalions. On the outbreak of the war the part-time Special Reserve (SR; formerly Militia) battalions were mobilised to supply these reinforcement drafts from Reservists, Special Reservists, returning wounded, and new recruits. The voluntary TF was also mobilised, and after its units volunteered for overseas service in August 1914 they began forming 2nd Line battalions to train their own recruits. By May 1915 the 2nd Line was also being prepared for overseas service, and the TF began forming 3rd Line (in some cases 4th Line) units for training. Meanwhile, the battalions of the 1st, 2nd and 3rd New Armies ('K1', 'K2' and 'K3' of 'Kitchener's Army') were quickly formed at the regimental depots. The SR battalions also swelled with new recruits and were soon well above their establishment strength. By the autumn the depots were overwhelmed, and on 8 October 1914 each SR battalion at its coast defence station was ordered to use its surplus to form a service battalion of the 4th New Army ('K4'). These were organised into six new divisions (30th–35th) divided into 18 brigades (89th–106th). However, on 10 April 1915 the War Office decided to convert the K4 battalions into reserve units, to provide drafts for the K1–K3 battalions in the same way that the SR was doing for the Regular battalions. The K4 divisions were scrapped and their brigades renumbered as 1st–18th Reserve Brigades (the original brigade and division numbers were re-allocated to the 'Pals battalions' of K5). Later the depot companies of the K5 battalions were combined into reserve battalions, and grouped into 19th–26th Reserve Brigades.
On 1 September 1916 the whole training system was centralised with the formation of the Training Reserve (TR). The K4 and K5 reserve battalions lost their regimental affiliation and were redesignated as 1st–112th TR battalions, to which all recruits not required for the regimental reserves (SR and TF) were posted. They were issued with 'General Service' badges and could be drafted to any regiment, but the training officers and non-commissioned officers remained part of their parent regiments. The reserve brigades had now been concentrated at large training camps, and the TR had a total establishment of 209,537 men. Reserve brigades for the Machine Gun Corps were introduced in 1918. There was no change to the status or organisation of the SR battalions, but on 1 September 1916, the 3rd Line TF battalions (referred to as reserve battalions since 1 April) were amalgamated into only one, two or at most three per infantry regiment, and grouped into new reserve brigades bearing the titles of the TF divisions they were reinforcing.
The scheme was further developed to provide for the progressive training of recruits under 19 years old (when they could be sent overseas). Of the 112 TR battalions, 42 were selected: 14 became 'Young Soldier Battalions' and 28 became 'Graduated Battalions'. When a recruit had finished initial training in the Young Soldier Battalion he was sent to one of two associated Graduated battalions, in which the four companies were organised by age, for training in 3-monthly steps between 18 and 19 years. As a result, every 3 months, 28 companies of newly trained 19-year-old soldiers were ready for drafting to France. In due course the War Office decided that Graduated battalions could be used for home defence while the men completed their training (as was the case with the SR). The Graduated battalions then began to be transferred from the Reserve brigades to replace 2nd Line TF battalions in the Home Service divisions. They were renumbered from 201st upwards, but later were once again affiliated with a particular regiment and numbered as the 51st (G), 52nd (G) or 53rd (YS) battalions of their regiment.

## List of brigades
### Reserve Brigades

| Reserve brigade | Training camp September 1916 | Original battalions | TR battalion number September 1916 |
| 1st Reserve Brigade (former 89th Brigade) | Rugeley | 16th (Reserve) Battalion, Durham Light Infantry | 1st |
| 1st Reserve Brigade (former 89th Brigade) | Rugeley | 17th (Reserve) Battalion, Durham Light Infantry | 2nd |
| 1st Reserve Brigade (former 89th Brigade) | Rugeley | 10th (Reserve) Battalion, North Staffordshire Regiment | 3rd |
| 1st Reserve Brigade (former 89th Brigade) | Rugeley | 11th (Reserve) Battalion, North Staffordshire Regiment | 4th |
| 1st Reserve Brigade (former 89th Brigade) | Rugeley | 10th (Reserve) Battalion, Leicestershire Regiment | 5th |
| 2nd Reserve Brigade (former 90th Brigade) | Brocton | 13th (Reserve) Battalion, West Yorkshire Regiment | 6th |
| 2nd Reserve Brigade (former 90th Brigade) | Brocton | 9th (Reserve) Battalion, East Yorkshire Regiment | 7th |
| 2nd Reserve Brigade (former 90th Brigade) | Brocton | 11th (Reserve) Battalion, King's Own Yorkshire Light Infantry | 8th |
| 2nd Reserve Brigade (former 90th Brigade) | Brocton | 11th (Reserve) Battalion, South Staffordshire Regiment | 9th |
| 2nd Reserve Brigade (former 90th Brigade) | Brocton | 15th (Reserve) Battalion, Green Howards | 10th |
| 3rd Reserve Brigade (former 91st Brigade) | Brocton | 9th (Reserve) Battalion, Lincolnshire Regiment | 11th |
| 3rd Reserve Brigade (former 91st Brigade) | Brocton | 13th (Reserve) Battalion, Sherwood Foresters | 12th |
| 3rd Reserve Brigade (former 91st Brigade) | Brocton | 14th (Reserve) Battalion, Sherwood Foresters | 13th |
| 3rd Reserve Brigade (former 91st Brigade) | Brocton | 14th (Reserve) Battalion, Manchester Regiment | 14th |
| 3rd Reserve Brigade (former 91st Brigade) | Brocton | 13th (Reserve) Battalion, Lancashire Fusiliers | 15th |
| 4th Reserve Brigade (former 92nd Brigade) | Seaford | 11th (Reserve) Battalion, Gloucestershire Regiment | 16th |
| 4th Reserve Brigade (former 92nd Brigade) | Seaford | 11th (Reserve) Battalion, Loyal North Lancashire Regiment | 17th |
| 4th Reserve Brigade (former 92nd Brigade) | Seaford | 14th (Reserve) Battalion, King's Royal Rifle Corps | |
| 4th Reserve Brigade (former 92nd Brigade) | Seaford | 15th (Reserve) Battalion, King's Royal Rifle Corps | 18th |
| 4th Reserve Brigade (former 92nd Brigade) | Seaford | 14th (Reserve) Battalion, Rifle Brigade | 19th |
| 4th Reserve Brigade (former 92nd Brigade) | Seaford | 15th (Reserve) Battalion, Rifle Brigade | 20th |
| 5th Reserve Brigade (former 93rd Brigade) | Shoreham | 9th (Reserve) Battalion, Queen's (Royal West Surrey Regiment) | 21st |
| 5th Reserve Brigade (former 93rd Brigade) | Shoreham | 11th (Reserve) Battalion, East Surrey Regiment | |
| 5th Reserve Brigade (former 93rd Brigade) | Shoreham | 16th (Reserve) Battalion, Royal Fusiliers | 22nd |
| 5th Reserve Brigade (former 93rd Brigade) | Shoreham | 9th (Reserve) Battalion, Queens Own (Royal West Kent Regiment) | |
| 5th Reserve Brigade (former 93rd Brigade) | Shoreham | 10th (Reserve) Battalion, Royal Sussex Regiment | 23rd |
| 5th Reserve Brigade (former 93rd Brigade) | Shoreham | 14th (Reserve) Battalion, Middlesex Regiment | 24th |
| 5th Reserve Brigade (former 93rd Brigade) | Shoreham | 15th (Reserve) Battalion, Middlesex Regiment | |
| 6th Reserve Brigade (former 94th Brigade) | Harwich | 10th (Reserve) Battalion, Norfolk Regiment | 25th |
| 6th Reserve Brigade (former 94th Brigade) | Harwich | 10th (Reserve) Battalion, Suffolk Regiment | 26th |
| 6th Reserve Brigade (former 94th Brigade) | Harwich | 9th (Reserve) Battalion, Bedfordshire Regiment | |
| 6th Reserve Brigade (former 94th Brigade) | Harwich | 10th (Reserve) Battalion, Bedfordshire Regiment | 27th |
| 6th Reserve Brigade (former 94th Brigade) | Harwich | 8th (Reserve) Battalion, Northamptonshire Regiment | 28th |
| 7th Reserve Brigade (former 95th Brigade) | Dover | 9th (Reserve) Battalion, Buffs (East Kent Regiment) | 29th |
| 7th Reserve Brigade (former 95th Brigade) | Dover | 10th (Reserve) Battalion, East Surrey Regiment | 30th |
| 7th Reserve Brigade (former 95th Brigade) | Dover | 14th (Reserve) Battalion, Royal Fusiliers | 31st |
| 7th Reserve Brigade (former 95th Brigade) | Dover | 15th (Reserve) Battalion, Royal Fusiliers | 32nd |
| 8th Reserve Brigade (former 96th Brigade) | Wool | 13th (Reserve) Battalion, Royal Warwickshire Regiment | 33rd |
| 8th Reserve Brigade (former 96th Brigade) | Wool | 13th (Reserve) Battalion, Hampshire Regiment | 34th |
| 8th Reserve Brigade (former 96th Brigade) | Wool | 7th (Reserve) Battalion, Dorset Regiment | 35th |
| 8th Reserve Brigade (former 96th Brigade) | Wool | 9th (Reserve) Battalion, Oxfordshire and Buckinghamshire Light Infantry | 36th |
| 8th Reserve Brigade (former 96th Brigade) | Wool | 9th (Reserve) Battalion, Royal Berkshire Regiment | 37th |
| 8th Reserve Brigade (former 96th Brigade) | Wool | 8th (Reserve) Battalion, Wiltshire Regiment | |
| 9th Reserve Brigade (former 97th Brigade) | Dunfermline | 11th (Reserve) Battalion, Black Watch | 38th |
| 9th Reserve Brigade (former 97th Brigade) | Dunfermline | 10th (Reserve) Battalion, Seaforth Highlanders | 39th |
| 9th Reserve Brigade (former 97th Brigade) | Dunfermline | 8th (Reserve) Battalion, Cameron Highlanders | 40th |
| 9th Reserve Brigade (former 97th Brigade) | Dunfermline | 13th (Reserve) Battalion, Argyll & Sutherland Highlanders | 41st |
| 9th Reserve Brigade (former 97th Brigade) | Dunfermline | 11th (Reserve) Battalion, Gordon Highlanders | 42nd |
| 10th Reserve Brigade (former 98th Brigade) | Wareham | 10th (Reserve) Battalion, King's Own Royal Regiment (Lancaster) | 43rd |
| 10th Reserve Brigade (former 98th Brigade) | Wareham | 11th (Reserve) Battalion, Devonshire Regiment | 44th |
| 10th Reserve Brigade (former 98th Brigade) | Wareham | 9th (Reserve) Battalion, Somerset Light Infantry | 45th |
| 10th Reserve Brigade (former 98th Brigade) | Wareham | 12th (Reserve) Battalion, Worcestershire Regiment | |
| 10th Reserve Brigade (former 98th Brigade) | Wareham | 13th (Reserve) Battalion, Worcestershire Regiment | 46th |
| 10th Reserve Brigade (former 98th Brigade) | Wareham | 10th (Reserve) Battalion, East Lancashire Regiment | 47th |
| 11th Reserve Brigade (former 99th Brigade) | Prees Heath | 9th (Reserve) Battalion, Shropshire Light Infantry | 48th |
| 11th Reserve Brigade (former 99th Brigade) | Prees Heath | 15th (Reserve) Battalion, King's (Liverpool Regiment) | 49th |
| 11th Reserve Brigade (former 99th Brigade) | Prees Heath | 16th (Reserve) Battalion, King's (Liverpool Regiment) | |
| 11th Reserve Brigade (former 99th Brigade) | Prees Heath | 14th (Reserve) Battalion, Cheshire Regiment | 50th |
| 11th Reserve Brigade (former 99th Brigade) | Prees Heath | 10th (Reserve) Battalion, South Lancashire Regiment | 51st |
| 12th Reserve Brigade (former 100th Brigade) | Kinghorn | 13th (Reserve) Battalion, Highland Light Infantry | 52nd |
| 12th Reserve Brigade (former 100th Brigade) | Kinghorn | 9th (Reserve) Battalion, King's Own Scottish Borderers | 53rd |
| 12th Reserve Brigade (former 100th Brigade) | Kinghorn | 14th (Reserve) Battalion, Royal Scots | 54th |
| 12th Reserve Brigade (former 100th Brigade) | Kinghorn | 9th (Reserve) Battalion, Royal Scots Fusiliers | 55th |
| 12th Reserve Brigade (former 100th Brigade) | Kinghorn | 12th (Reserve) Battalion, Scottish Rifles | 56th |
| 13th Reserve Brigade (former 101st Brigade) | Kinmel Park | 9th (Reserve) Battalion, South Wales Borderers | 57th |
| 13th Reserve Brigade (former 101st Brigade) | Kinmel Park | 12th (Reserve) Battalion, Welsh Regiment | 58th |
| 13th Reserve Brigade (former 101st Brigade) | Kinmel Park | 13th (Reserve) Battalion, South Wales Borderers | 59th |
| 13th Reserve Brigade (former 101st Brigade) | Kinmel Park | 20th (Reserve) Battalion (3rd Rhondda), Welsh Regiment | 60th |
| 13th Reserve Brigade (former 101st Brigade) | Kinmel Park | 21st (Reserve) Battalion, Welsh Regiment | 61st |
| 14th Reserve Brigade (former 102nd Brigade) | Kinmel Park | 12th (Reserve) Battalion, Royal Welsh Fusiliers | 62nd |
| 14th Reserve Brigade (former 102nd Brigade) | Kinmel Park | 18th and 20th (Reserve) Battalions, Royal Welsh Fusiliers | 63rd |
| 14th Reserve Brigade (former 102nd Brigade) | Kinmel Park | 21st and 22nd (Reserve) Battalions, Royal Welsh Fusiliers | 64th |
| 14th Reserve Brigade (former 102nd Brigade) | Kinmel Park | 14th (Reserve) Battalion, South Wales Borderers | 65th |
| 14th Reserve Brigade (former 102nd Brigade) | Kinmel Park | 22nd (Reserve) Battalion, the Welsh Regiment | 66th |
| 15th (Ulster) Reserve Brigade (former 103rd Brigade) | Ireland | 3rd (Reserve) Battalion, Royal Inniskilling Fusiliers | – |
| 15th (Ulster) Reserve Brigade (former 103rd Brigade) | Ireland | 4th (Extra Reserve) Battalion, Royal Inniskilling Fusiliers | – |
| 15th (Ulster) Reserve Brigade (former 103rd Brigade) | Ireland | 12th (Reserve) Battalion, Royal Inniskilling Fusiliers | |
| 15th (Ulster) Reserve Brigade (former 103rd Brigade) | Ireland | 3rd (Reserve) Battalion, Royal Irish Rifles | – |
| 15th (Ulster) Reserve Brigade (former 103rd Brigade) | Ireland | 4th (Extra Reserve) Battalion, Royal Irish Rifles | – |
| 15th (Ulster) Reserve Brigade (former 103rd Brigade) | Ireland | 5th (Extra Reserve) Battalion, Royal Irish Rifles | – |
| 15th (Ulster) Reserve Brigade (former 103rd Brigade) | Ireland | 3rd (Reserve) Battalion, Royal Irish Fusiliers | – |
| 15th (Ulster) Reserve Brigade (former 103rd Brigade) | Ireland | 4th (Extra Reserve) Battalion, Royal Irish Fusiliers | – |
| 16th Reserve Brigade (former 104th Brigade) | Altcar | 21st (Reserve) Battalion, King's (Liverpool Regiment) | 67th |
| 16th Reserve Brigade (former 104th Brigade) | Altcar | 22nd (Reserve) Battalion, King's (Liverpool Regiment) | 68th |
| 16th Reserve Brigade (former 104th Brigade) | Altcar | 25th (Reserve) Battalion, Manchester Regiment | 69th |
| 16th Reserve Brigade (former 104th Brigade) | Altcar | 26th (Reserve) Battalion, Manchester Regiment | 70th |
| 16th Reserve Brigade (former 104th Brigade) | Altcar | 27th (Reserve) Battalion, Manchester Regiment | 71st |
| 17th Reserve Brigade (former 105th Brigade) | Prees Heath | 21st (Reserve) Battalion, Lancashire Fusiliers | 72nd |
| 17th Reserve Brigade (former 105th Brigade) | Prees Heath | 22nd (Reserve) Battalion, Lancashire Fusiliers | 73rd |
| 17th Reserve Brigade (former 105th Brigade) | Prees Heath | 17th (Reserve) Battalion, Cheshire Regiment | 74th |
| 17th Reserve Brigade (former 105th Brigade) | Prees Heath | 12th (Reserve) Battalion, East Lancashire Regiment | 75th |
| 17th Reserve Brigade (former 105th Brigade) | Prees Heath | 12th (Reserve) Battalion, King's Own (Royal Lancaster Regiment) | 76th |
| 18th Reserve Brigade (former 106th Brigade) | Dundee | 18th (Reserve) Battalion, Royal Scots | 77th |
| 18th Reserve Brigade (former 106th Brigade) | Dundee | 19th (Reserve) Battalion, Highland Light Infantry | 78th |
| 18th Reserve Brigade (former 106th Brigade) | Dundee | 20th (Reserve) Battalion, Highland Light Infantry | 79th |
| 19th Reserve Brigade | Newcastle upon Tyne | 32nd (Reserve) Battalion, Northumberland Fusiliers | 80th |
| 19th Reserve Brigade | Newcastle upon Tyne | 14th (Reserve) Battalion, Yorkshire Regiment | 81st |
| 19th Reserve Brigade | Newcastle upon Tyne | 11th (Reserve) Battalion, Lincolnshire Regiment | 82nd |
| 19th Reserve Brigade | Newcastle upon Tyne | 12th (Reserve) Battalion, Leicestershire Regiment | 83rd |
| 20th Reserve Brigade (1st Training Brigade, MGC, early 1918) | Hornsea | 29th (Reserve) Battalion, Northumberland Fusiliers re-designated "A" Battalion, MGC | 84th |
| 20th Reserve Brigade (1st Training Brigade, MGC, early 1918) | Hornsea | 30th (Reserve) Battalion, Northumberland Fusiliers re-designated "B" Battalion, MGC | 85th |
| 20th Reserve Brigade (1st Training Brigade, MGC, early 1918) | Hornsea | 31st (Reserve) Battalion, Northumberland Fusiliers re-designated "C" Battalion, MGC | 86th |
| 20th Reserve Brigade (1st Training Brigade, MGC, early 1918) | Hornsea | 21st (Reserve) Battalion, Durham Light Infantry re-designated "D" Battalion, MGC | 87th |
| 20th Reserve Brigade (1st Training Brigade, MGC, early 1918) | Hornsea | 23rd (Reserve) Battalion, Durham Light Infantry | |
| 21st Reserve Brigade | Blyth, Northumberland | 19th (Reserve) Battalion, West Yorkshire Regiment | 88th |
| 21st Reserve Brigade | Blyth, Northumberland | 20th (Reserve) Battalion, West Yorkshire Regiment | 89th |
| 21st Reserve Brigade | Blyth, Northumberland | 14th (Reserve) Battalion, East Yorkshire Regiment (Hull) | 90th |
| 21st Reserve Brigade | Blyth, Northumberland | 15th (Reserve) Battalion, East Yorkshire Regiment | |
| 21st Reserve Brigade | Blyth, Northumberland | 15th (Reserve) Battalion, York and Lancaster Regiment | 91st |
| 21st Reserve Brigade | Blyth, Northumberland | 24th (Reserve) Battalion, King's Royal Rifle Corps | |
| 22nd Reserve Brigade | Chiseldon | 17th (Reserve) Battalion, Royal Warwickshire Regiment | 92nd |
| 22nd Reserve Brigade | Chiseldon | 15th (Reserve) Battalion, Gloucestershire Regiment | 93rd |
| 22nd Reserve Brigade | Chiseldon | 16th (Reserve) Battalion, Gloucestershire Regiment | 94th |
| 22nd Reserve Brigade | Chiseldon | 11th (Reserve) Battalion, Duke of Cornwall's Light Infantry | 95th |
| 22nd Reserve Brigade | Chiseldon | 16th (Reserve) Battalion, Hampshire Regiment (Portsmouth) | 96th |
| 23rd Reserve Brigade | Northampton, to Aldershot May 1916 | 12th (Reserve) Battalion, Queen's (Royal West Surrey Regiment) | 97th |
| 23rd Reserve Brigade | Northampton, to Aldershot May 1916 | 14th (Reserve) Battalion, Essex Regiment | 98th |
| 23rd Reserve Brigade | Northampton, to Aldershot May 1916 | 12th (Reserve) Battalion, Royal West Kents | 99th |
| 23rd Reserve Brigade | Northampton, to Aldershot May 1916 | 24th (Reserve) Battalion, Middlesex Regiment | 100th |
| 23rd Reserve Brigade | Northampton, to Aldershot May 1916 | 27th (Reserve) Battalion, Middlesex Regiment | 101st |
| 23rd Reserve Brigade | Northampton, to Aldershot May 1916 | 28th (Reserve) Battalion, Middlesex Regiment | 102nd |
| 24th Reserve Brigade | Edinburgh | 27th (Reserve) Battalion, Royal Fusiliers | 103rd |
| 24th Reserve Brigade | Edinburgh | 28th (Reserve) Battalion, Royal Fusiliers | 104th |
| 24th Reserve Brigade | Edinburgh | 29th (Reserve) Battalion, Royal Fusiliers | 105th |
| 24th Reserve Brigade | Edinburgh | 30th (Reserve) Battalion, Royal Fusiliers | 106th |
| 24th Reserve Brigade | Edinburgh | 31st (Reserve) Battalion, Royal Fusiliers | 107th |
| 25th (Irish) Reserve Brigade | Curragh Camp, to Larkhill April 1918 | 5th (Extra Reserve) Battalion, Royal Irish Rifles | – |
| 25th (Irish) Reserve Brigade | Curragh Camp, to Larkhill April 1918 | 5th (Extra Reserve) Battalion, Leinster Regiment | – |
| 25th (Irish) Reserve Brigade | Curragh Camp, to Larkhill April 1918 | 5th (Extra Reserve) Battalion, Royal Dublin Fusiliers | – |
| 25th (Irish) Reserve Brigade | Curragh Camp, to Larkhill April 1918 | 5th (Extra Reserve) Battalion, Royal Munster Fusiliers | – |
| 26th Reserve Brigade | Banbury, to Wimbledon by June 1916 | 13th (Reserve) Battalion, Suffolk Regiment (Cambridgeshire) | 108th |
| 26th Reserve Brigade | Banbury, to Wimbledon by June 1916 | 14th (Reserve) Battalion, East Surrey Regiment | |
| 26th Reserve Brigade | Banbury, to Wimbledon by June 1916 | 19th (Reserve) Battalion, King's Royal Rifle Corps | 109th |
| 26th Reserve Brigade | Banbury, to Wimbledon by June 1916 | 22nd (Reserve) Battalion, King's Royal Rifle Corps | 110th |
| 26th Reserve Brigade | Banbury, to Wimbledon by June 1916 | 23rd (Reserve) Battalion, King's Royal Rifle Corps | 111th |
| 26th Reserve Brigade | Banbury, to Wimbledon by June 1916 | 17th (Reserve) Battalion, Rifle Brigade | 112th |
| 28th Reserve Brigade (Formed early 1918, became 2nd Training Brigade, MGC) | | "E" Battalion, MGC | 113th |
| 28th Reserve Brigade (Formed early 1918, became 2nd Training Brigade, MGC) | | "F" Battalion, MGC | 114th |
| 28th Reserve Brigade (Formed early 1918, became 2nd Training Brigade, MGC) | | "G" Battalion, MGC | 115th |
| 28th Reserve Brigade (Formed early 1918, became 2nd Training Brigade, MGC) | | "H" Battalion, MGC | 116th |

### Territorial Force Reserve Brigades

| Reserve brigade title | Battalions |
| Highland Reserve Brigade | 4th (Reserve) Battalion, Black Watch |
| Highland Reserve Brigade | 4th (Reserve) Battalion, Seaforth Highlanders |
| Highland Reserve Brigade | 4th (Reserve) Battalion, Gordon Highlanders |
| Highland Reserve Brigade | 5th (Reserve) Battalion, Argyll and Sutherland Highlanders |
| Lowland Reserve Brigade | 4th (Reserve) Battalion, Royal Scots |
| Lowland Reserve Brigade | 9th (Reserve) Battalion, Royal Scots |
| Lowland Reserve Brigade | 4th (Reserve) Battalion, Royal Scots Fusiliers |
| Lowland Reserve Brigade | 4th (Reserve) Battalion, King's Own Scottish Borderers |
| Lowland Reserve Brigade | 5th (Reserve) Battalion, Scottish Rifles |
| Lowland Reserve Brigade | 5th (Reserve) Battalion, Highland Light Infantry |
| Lowland Reserve Brigade | 6th (Reserve) Battalion, Highland Light Infantry |
| West Lancashire Reserve Brigade | 5th (Reserve) Battalion, King's (Liverpool Regiment) |
| West Lancashire Reserve Brigade | 7th (Reserve) Battalion, King's (Liverpool Regiment) |
| West Lancashire Reserve Brigade | 10th (Reserve) Battalion, King's (Liverpool Regiment) |
| West Lancashire Reserve Brigade | 4th (Reserve) Battalion, South Lancashire Regiment |
| West Lancashire Reserve Brigade | 4th (Reserve) Battalion, South Lancashire Regiment |
| West Lancashire Reserve Brigade | 4th (Reserve) Battalion, Loyal North Lancashire Regiment |
| East Lancashire Reserve Brigade | 5th (Reserve) Battalion, Lancashire Fusiliers |
| East Lancashire Reserve Brigade | 4th (Reserve) Battalion, East Lancashire Regiment |
| East Lancashire Reserve Brigade | 4th (Reserve) Battalion, Border Regiment |
| East Lancashire Reserve Brigade | 5th (Reserve) Battalion, Manchester Regiment |
| Welsh Reserve Brigade | 4th (Reserve) Battalion, Cheshire Regiment |
| Welsh Reserve Brigade | 4th (Reserve) Battalion, Royal Welsh Fusiliers |
| Welsh Reserve Brigade | 4th (Reserve) Battalion, Welsh Regiment |
| Welsh Reserve Brigade | 4th (Reserve) Battalion, Shropshire Light Infantry |
| Welsh Reserve Brigade | 1st (Reserve) Battalion, Monmouthshire Regiment |
| Welsh Reserve Brigade | 1st (Reserve) Battalion, Brecknockshire Battalion |
| Welsh Reserve Brigade | 1st (Reserve) Battalion, Herefordshire Regiment |
| Northumbrian Reserve Brigade | 4th (Reserve) Battalion, Northumberland Fusiliers |
| Northumbrian Reserve Brigade | 4th (Reserve) Battalion, East Yorkshire Regiment |
| Northumbrian Reserve Brigade | 4th Reserve) Battalion, Green Howards |
| Northumbrian Reserve Brigade | 5th (Reserve) Battalion, Durham Light Infantry |
| West Riding Reserve Brigade | 5th (Reserve) Battalion, West Yorkshire Regiment |
| West Riding Reserve Brigade | 7th (Reserve) Battalion, West Yorkshire Regiment |
| West Riding Reserve Brigade | 4th (Reserve) Battalion, Duke of Wellington's Regiment |
| West Riding Reserve Brigade | 6th (Reserve) Battalion, Duke of Wellington's Regiment |
| West Riding Reserve Brigade | 4th (Reserve) Battalion, King's Own Yorkshire Light Infantry |
| West Riding Reserve Brigade | 4th (Reserve) Battalion, York and Lancaster Regiment |
| North Midland Reserve Brigade | 4th (Reserve) Battalion, Lincolnshire Regiment |
| North Midland Reserve Brigade | 4th (Reserve) Battalion, Leicestershire Regiment |
| North Midland Reserve Brigade | 5th (Reserve) Battalion, South Staffordshire Regiment |
| North Midland Reserve Brigade | 5th (Reserve) Battalion, Sherwood Foresters |
| North Midland Reserve Brigade | 5th (Reserve) Battalion, North Staffordshire Regiment |
| South Midland Reserve Brigade | 5th (Reserve) Battalion, Royal Warwickshire Regiment |
| South Midland Reserve Brigade | 7th (Reserve) Battalion, Royal Warwickshire Regiment |
| South Midland Reserve Brigade | 4th (Reserve) Battalion, Gloucestershire Regiment |
| South Midland Reserve Brigade | 7th (Reserve) Battalion, Worcestershire Regiment |
| South Midland Reserve Brigade | 4th (Reserve) Battalion, Oxfordshire and Buckinghamshire Light Infantry |
| South Midland Reserve Brigade | 4th (Reserve) Battalion, Royal Berkshire Regiment |
| East Anglian Reserve Brigade | 4th (Reserve) Battalion, Norfolk Regiment |
| East Anglian Reserve Brigade | 4th (Reserve) Battalion, Suffolk Regiment (later Cambridge and Suffolk Reserve Bn) |
| East Anglian Reserve Brigade | 5th (Reserve) Battalion, Bedfordshire Regiment |
| East Anglian Reserve Brigade | 4th (Reserve) Battalion, Essex Regiment |
| East Anglian Reserve Brigade | 4th (Reserve) Battalion, Northamptonshire Regiment |
| East Anglian Reserve Brigade | 1st (Reserve) Battalion, Cambridgeshire Regiment |
| East Anglian Reserve Brigade | 1st (Reserve) Battalion, Hertfordshire Regiment |
| Home Counties Reserve Brigade | 4th (Reserve) Battalion, Queen's (Royal West Surrey) Regiment |
| Home Counties Reserve Brigade | 4th (Reserve) Battalion, Buffs (East Kent Regiment) |
| Home Counties Reserve Brigade | 5th (Reserve) Battalion, East Surrey Regiment |
| Home Counties Reserve Brigade | 4th (Reserve) Battalion, Royal Sussex Regiment |
| Home Counties Reserve Brigade | 4th (Reserve) Battalion, Royal West Kent Regiment |
| Home Counties Reserve Brigade | 7th (Reserve) Battalion, Middlesex Regiment |
| Wessex Reserve Brigade | 4th (Reserve) Battalion, Devonshire Regiment |
| Wessex Reserve Brigade | 4th (Reserve) Battalion, Somerset Light Infantry |
| Wessex Reserve Brigade | 4th (Reserve) Battalion, Duke of Cornwall's Light Infantry |
| Wessex Reserve Brigade | 4th (Reserve) Battalion, Hampshire Regiment |
| Wessex Reserve Brigade | 5th (Reserve) Battalion, Hampshire Regiment |
| Wessex Reserve Brigade | 4th (Reserve) Battalion, Dorset Regiment |
| Wessex Reserve Brigade | 4th (Reserve) Battalion, Wiltshire Regiment |
| 1st London Reserve Brigade | 1st (Reserve) Battalion, London Regiment |
| 1st London Reserve Brigade | 3rd (Reserve) Battalion, London Regiment |
| 1st London Reserve Brigade | 5th (Reserve) Battalion, London Regiment |
| 1st London Reserve Brigade | 6th (Reserve) Battalion, London Regiment |
| 1st London Reserve Brigade | 8th (Reserve) Battalion, London Regiment |
| 1st London Reserve Brigade | 9th (Reserve) Battalion, London Regiment |
| 1st London Reserve Brigade | 10th (Reserve) Battalion, London Regiment |
| 1st London Reserve Brigade | 1st (Reserve) Battalion, Honourable Artillery Company |
| 2nd London Reserve Brigade | 13th (Reserve) Battalion, London Regiment |
| 2nd London Reserve Brigade | 14th (Reserve) Battalion, London Regiment |
| 2nd London Reserve Brigade | 15th (Reserve) Battalion, London Regiment |
| 2nd London Reserve Brigade | 16th (Reserve) Battalion, London Regiment |
| 2nd London Reserve Brigade | 17th (Reserve) Battalion, London Regiment |
| 2nd London Reserve Brigade | 18th (Reserve) Battalion, London Regiment |
| 2nd London Reserve Brigade | 19th (Reserve) Battalion, London Regiment |
| 2nd London Reserve Brigade | 20th (Reserve) Battalion, London Regiment |
| 2nd London Reserve Brigade | 21st (Reserve) Battalion, London Regiment |
| 2nd London Reserve Brigade | 22nd (Reserve) Battalion, London Regiment |
| 3rd London Reserve Brigade (formed January 1918) | 13th (Reserve) Battalion, London Regiment |
| 3rd London Reserve Brigade (formed January 1918) | 15th (Reserve) Battalion, London Regiment |
| 3rd London Reserve Brigade (formed January 1918) | 16th (Reserve) Battalion, London Regiment |
| 3rd London Reserve Brigade (formed January 1918) | 17th (Reserve) Battalion, London Regiment |

## Note

* ↑ Absorbed into the other battalions of 4th Reserve Bde
* ↑ Amalgamated with 9th Queen's to form 21st TR Battalion
* ↑ Absorbed into 16th (Reserve) Battalion, Royal Fusiliers'"`UNIQ--ref-0000004A-QINU`"'
* ↑ Absorbed into the other battalions of 5th Reserve Bde
* ↑ Absorbed into the other battalions of 6th Reserve Bde'"`UNIQ--ref-0000004D-QINU`"''"`UNIQ--ref-0000004E-QINU`"'
* ↑ Absorbed into the other battalions of 8th Reserve Bde
* ↑ Absorbed into the other battalions of 10th Reserve Bde
* ↑ Absorbed into the other battalions of 11th Reserve Bde
* ↑ Absorbed into 3rd (Reserve) Battalion, Royal Inniskilling Fusiliers
* ↑ Absorbed into the other battalions of 20th Reserve Bde
* ↑ Absorbed into 15th (Reserve) Battalion, York and Lancaster Regiment'"`UNIQ--ref-00000055-QINU`"'
* ↑ Absorbed into the other battalions of 21st Reserve Bde
* ↑ Absorbed into the other battalions of 26th Reserve Bde'"`UNIQ--ref-00000058-QINU`"'