Engineers are allotted to the larger formations of all Arms in the field, to carry out the varied work required with the troops at the front, as described in Chapter II. In foreign armies they are organized in Companies belonging to the Engineer Battalion of the Army Corps, and one Company is allotted to each Division, and one to the Corps Troops. Its strength is that of the Infantry Company (250 men), under a Captain, with three or four officers. In order that its tools and stores shall accompany it and be at hand for work, each Company has transport allotted to it from the “Train Battalion” of the Army Corps. The Cavalry Division has generally some Engineers, who are mounted or carried on wagons, so as to keep up with the Division. A reserve of tools and equipment for the Companies is carried by a column of wagons called the _Army Corps Engineer Park_. In the British Service there are with each Division two _Field Companies_ of Engineers, each having 156 working sappers, and with the Cavalry Division four _Field Troops_, each with 40 working sappers, half of whom are mounted, half carried on the tool carts. Thus, if a Cavalry Brigade is detached, it can take with it a Field Troop of Engineers. The drivers and transport are integral portions of the Engineer Troops and Companies. _Telegraph Companies_ of Engineers are in all armies allotted to each Command for inter-communication purposes. Those of the British Service are described later among the Administrative Services, in Chapter IX. Another Unit of Engineers is the _Bridging Train_, which supplements the small bridge equipment carried by the Engineer Field Companies. In foreign armies these Trains are manned by Engineers, but horsed by the “Train,” and one is allotted to each Division and Army Corps. In the British Service the Bridging Trains are “Army Troops,” and are not allotted to Divisions. CHAPTER IV NEW VARIETIES OF FIGHTING TROOPS It was mentioned in Chapter II. that of late years there have been added to modern armies a number of new varieties of troops, which it is not possible to group under the old heads of the Three Arms. These varieties may be described under the following heads: 1. Mounted Infantry. 2. Mountain Infantry. 3. Mountain Artillery. 4. Machine Guns. 5. Cavalry Pioneers. 6. Cyclists and Motor Cars. 7. Scouts. 8. Field Orderlies. 9. Military Police. A short description of the functions and organization of these troops will now be given. 1. MOUNTED INFANTRY Mounted Infantry is to-day what Dragoons were when first introduced--that is, Infantry mounted only so as to be quickly moved to a point where it is to fight on foot. Mounted Infantry is armed only with the rifle, and is neither trained nor armed for shock action on horseback.