Wellington organized in the Peninsula a Corps of Guides and a Mounted Staff Corps, who acted as despatch riders and police. Napoleon had similar corps, and their usefulness is obvious. But it may be doubted if the multiplication of small special corps is not objectionable and wasteful of men and horses. Modern practice tends to allot the carrying of messages and Orders to orderlies furnished at Head-Quarters of Commands, either by Cyclists, by the men of the Cavalry escort, or by the Mounted Police. The Germans have always had at Head-Quarters a small corps of _Feldjägers_, or mounted orderlies, for carrying despatches, and have now formed a body of motor-cycle volunteers for this purpose. In the British Cavalry Division, four men from every squadron are trained as despatch riders, and Officers of the “Motor Reserve,” with their cars, are attached to every Head-Quarters, for carrying Orders and messages. There is a _Courier Corps_ in the Russian Service, which provides one section of 4 Officers and 6 N.C.O.’s for each Army Corps Head-Quarters. Two sections are allotted to Army Commands. 9. MILITARY POLICE A body of _Police_ is now a necessity for an Army. They comprise _Mounted_, as well as _Foot Police_. Their duties are to enforce sanitary regulations, to preserve order, especially in rear of the Army, and to carry out sentences of Courts-Martial. They ensure regularity in allotting billets and enforcing requisitions. They control sutlers and civilians with the Army, protect civil property, prevent marauding, and arrest stragglers, deserters, and spies. During action they will be useful in clearing roads, and maintaining order in rear of the fighting, and later will keep off the ghouls who infest the battlefield to plunder the dead and kill the wounded. Small detachments of Military Police are in the British Service attached to all Head-Quarters, under the orders of the Assistant-Provost-Marshal. Foot Police will be attached to General Head-Quarters and those of the L. of C.; Mounted Police to all other Head-Quarters; while at Base Head-Quarters there will be both. CHAPTER V FORMATIONS OF ALL ARMS The Larger Formations are formed by combining in one body a number of the Smaller Formations composed of Units of each Arm, together with the Administrative Units required for their service. The body thus formed is then provided with _Head-Quarters_, comprising the Commander and his Staff, and other necessary personnel. The numbers of Units and of Lesser Formations grouped together, and their proportion to each other, are dictated by past experience and a forecast of future fighting requirements.