The officers on duty in the Adjutant-General's and Quartermaster's departments of the British army are, as a rule, detailed for a term of five years from the Line, but must rejoin their regiments immediately upon orders for foreign service. The Royal Engineers then were and are organized into forty-three companies. The cavalry is divided into the Household Cavalry and Cavalry of the Line. The first named comprises the 1st and 2d Life Guards and Royal Horse Guards,--three regiments. The Line is composed of twenty-eight regiments, as follows: seven of dragoon guards, three of dragoons, thirteen of hussars, five of lancers. The strength of regiments varies from 450 to 625 men with from 300 to 400 troop horses each. The artillery--under the title of the Royal Regiment of Artillery--is divided into three classes; the Royal Horse Artillery of two brigades of twelve batteries each, making a brigade total of sixty guns; the Field Artillery of four, brigades of seventy-six batteries, and the Garrison Artillery of eleven brigades. For the non-professional reader it may be well to say that, in the horse artillery, all the _personnel_ of a battery is mounted, the better to act with cavalry or mounted infantry; under the general term "field artillery" may be classed mountain batteries (only maintained in India), field batteries proper, in which the guns are somewhat heavier, and served by gunners who are not mounted, but on occasion are carried on the limbers and on seats attached to the axles, and in an emergency may be carried on the "off" horses of teams. Under the class "field artillery," also, would come such large guns as are required in war for siege or other heavy operations, and which in India or Afghanistan would be drawn by bullocks. The infantry is composed of the Guards, the Line, and the Rifles. The Guards consist of three regiments--Grenadier Guards, Coldstream Guards, and Scots Fusilier Guards; in all seven battalions. The Line comprises 102 regiments (204 battalions); the Rifles four battalions. Besides these there are two regiments of Colonial (West India) colored troops. The Militia is intended for local defence, but can be ordered anywhere within the United Kingdom, and is available for garrison duty in the Mediterranean. Enlistment in the militia is for six years. The officers are commissioned by the Queen, and, as before noted, all the details of control and recruitment are entrusted to district commanders. For instruction this force may be called out, for a period not to exceed eight weeks annually, with regular officers as instructors. There are 212 battalions of infantry, 25 brigades of garrison artillery, and 3 regiments of engineers comprised in this force. The Militia Reserve, limited to one fourth of the active militia, is liable to army service in case of an emergency, and for the term of six years is entitled to L1 per annum.