The Royal Warwickshire Regiment seems to have been based at Sutton Mandeville between January 1916 and March 1917. For at least some of this time, it was the training battalion of the 7th Royal Warwicks, i.e. the 3/7th Royal Warwicks. The 3/7th trained soldiers for the first line unit, the 1/7th Royal Warwickshire Regiment, which formed part of the Warwickshire brigade within the 48th (South Midland) Division. The 48th Division fought on the Western Front from April 1915 to November 1917, when it moved to Italy.
The 3/7th may also have trained soldiers for the 2/7th Royal Warwicks. This was the second line unit, initially for home service only. The 2/7th formed part of the 61st (2nd South Midland) Division. The 61st Division moved to France in May 1916 and took part in the attack at Fromelles in July 1916, supplementing the Somme Offensive.
Further information about the Royal Warwickshire Regiment can be found in the posts below:
Posts about the Royal Warwickshire Regiment