We must not, however, assume that this deployment--in a cavalry division, for instance--requires that the various brigades shall draw away from each other at regulation intervals, and that the division will, in this formation, advance towards the enemy. This will generally be impossible; first, because it is usually advisable to seek the cover of the ground in order to be secure from possible hostile fire surprise, even when the enemy's artillery is not yet located; secondly, because the regulation frontage of deployment of a cavalry division is much too narrow to allow it to gain exterior lines, or to affect a concentric attack. The deployment must rather be carried out according to the demands of the situation at the moment, without regard to regulation intervals. The division commander will first of all detail a reserve for himself. To this he will then give the orders necessary for its conduct as well as to the advanced guard, the various groups of the main body, and the artillery and machine-guns. The direction of march of the various subdivisions will thus be determined according to the ground and the intentions of the commander, and it will also usually be necessary, in order to keep the troops well in hand, to order the advance by stages, and to regulate the pace. If the advance has been carried out in separate columns, the action of the smaller columns must be regulated before the deployment of the main column. A certain loss of time will here generally be found inevitable. The necessary preparations must therefore be made early enough to ensure that, if the junction of a detachment with the main body is intended, it will be possible to carry it out before contact with the enemy is made. It is a matter for especially careful and well-considered action if one of the lesser columns is to intervene from a flank direction in a fight which is already raging, an operation which may be of the most decisive importance, but difficult to effect in the rapid course of cavalry action. If, however, it is desired to reap the benefits of such action, an endeavour must be made to gain time by dismounted action for the arrival of the column which is to strike the decisive blow. Such measures will always be risky, but may lead to glorious results.