large unit formations for artillery

[Adrian Steer]

Just a query as to what formations a large unit of artillery can adopt when moving. Can it form a column 1 base wide or must is always be 2 bases wide? The rules as far as I can see only mentions two allowed formations limbered and unlimbered which implies a large unit of artillery is always two bases wide. Just a thought as I've just re-based my Russian artillery limbers to be 2 UD wide. may of wasted my time now I think on