A Machine Gun Company was attached to each Infantry Brigade and their subsequent Division.
|Brigade attached to:||15th Brigade|
|Division attached to:||5th Division|
|Formed from the:||Machine Gun Section of 1st Bn. The Norfolk Regiment|
|Machine Gun Section of 1st Bn. The Bedfordshire Regiment|
|Machine Gun Section of 1st Bn. The Cheshire Regiment|
|Machine Gun Section of 16th Bn. The Royal Warwickshire Regiment|
The 15th Bde. M.G. Coy. was formed on the 27 December 1915 from the Machine Gun Sections of the listed infantry battalions. The 1st Bn Dorsetshire Regiment was also a unit of the 15th Infantry Brigade on this date; however, it was transferred to the 95th Brigade, 32nd Division on 31 December 1915.
On 26 April 1918, it was amalgamated with the 13th, 95th (nee 14th) and 205th Machine Gun Companies to form No. 5 Battalion, Machine Gun Corps.
As a unit of the 5th Infantry Division, it will have taken part in the following battles and engagements.
|BATTLES OF THE SOMME|
|20 to 25 July||Attacks on High Woods [XV. Corps, Fourth Army].|
|03 to 06 September||Battle of Guillemont [XIV. Corps, Fourth Army].|
|18 to 22 September||Battle of Flers-Courcelette [XIV. Corps, Fourth Army].|
|25 and 26 September||Battle of Morval [XIV. Corps, Fourth Army].|
|BATTLES OF ARRAS|
|09 to 14 April||Battle of Vimy Ridge [Cdn. Corps, First Army].|
|23 April||Attack on la Coulotte [Cdn. Corps, First Army].|
|03 and 04 May||Third Battle of the Scarpe [Cdn. Corps, First Army].|
|28 June||Capture of Oppy Wood [XIII. Corps, First Army].|
|BATTLES OF YPRES|
|01 to 03 October||Battle of Polygon Wood [X. Corps, Second Army].|
|04 October||Battle of Broodseinde [X. Corps, Second Army].|
|09 October||Battle of Poelcappelle [X. Corps, Second Army].|
|26 October to 10 November||Second Battle of Passchendaele [X. Corps, Second Army].|
|On the 23rd of November the division was warned that it would be moved to Italy. Entrainment began on the 27th November, and concentration was completed by the 20th December to the east of the R. Brenta and not far from Padua. The division formed part of the XI. Corps.|
|BATTLES OF THE LYS|
|12 to 15 April||Battle of Hazebrouck, including Defence of Nieppe Forest [XI. Corps, First Army].|