Divisional Artillery Group
The group of artillery assets allocated to a particular division, and commanded by the CRA.
The key component of the division's OSG, typically it would have:
3 x Close Support Regiments
1 x HVM Regiment
with the likely addition of an STA Regiment or sub-units and could also have a Depth Fire Regiment (are they still called that?) allocated for a period of time.
In theory, the CRAs train set, to do with what he will. However, in common with all Gunner assets, the DRA can take them away at a second's notice if a higher priority task develops.