Encyclopaedia Britannica, 11th Edition, "Armour Plates" to "Arundel, Earls of"

every country except Great Britain, are the regiment, and, sometimes, the brigade of two or more regiments. These units are distributed to army corps, divisions and districts, in the same way as units of other arms (see ARMY). In Great Britain the Royal Regiment of Artillery still comprises the whole _personnel_ of the arm, being divided into the Royal Horse, Royal Field and Royal Garrison Artillery; to each branch Special Reserve and Territorial artillery are affiliated. Over and above the military command of these higher units, provision is usually made for technical control of the _materiel_, and a variety of training and experimental establishments, such as schools of gunnery, are maintained in all countries. The more special unit of organization in mobile artillery is the _brigade_, formerly called brigade-division (German, _Abteilung_; French _groupe_). The brigade is in Great Britain the administrative and tactical unit. Mountain artillery is not organized in brigades in the British empire. The unit consists, in the case of guns, of three batteries (18 guns, heavy artillery 12), in the case of field howitzers of two batteries (12 howitzers), and in the horse artillery of two batteries (12 guns), and is commanded by a lieutenant-colonel. To each brigade is allotted an ammunition column. The necessity for such a grouping of batteries will be apparent if the reader notes that 54 field guns, 12 howitzers and 4 heavy field guns form the artillery of a single British division of about 15,000 combatants.