If we decide to retire, a portion of the men will be detached to take the horses out of the village, or to have them drawn up in readiness for mounting behind the position selected, and meanwhile the remainder of the garrison must compensate for their diminution in numbers by a greater expenditure of ammunition, thus holding the enemy till all is ready, and then slipping rapidly back to their horses. Without losses--amounting, perhaps, to the sacrifice of the last covering party--such withdrawal can hardly hope to succeed; but previous systematic arrangements give the best chance of success, and the same prevision will be equally necessary, even if the place is to be held at all costs, for the situation may always change, and a retreat become advisable. At night, however, the aspect of affairs changes; then any attempt at withdrawal is to be deprecated, and, as a matter of principle, must not be contemplated. Even if the enemy breaks into the place by surprise, it is still better to fight him on the spot rather than to risk the certain destruction of the whole detachment by retreat. A successful resistance is in such cases all the more probable, since in the darkness the use of the enemy's Artillery is practically precluded--at any rate, can attain but little result. Only the squadrons far out in advance, and thus liable to be surrounded on all sides and captured before help can arrive, will have to be prepared for a night withdrawal before the assailants can close in around them. As to the principles to be observed in such cases, there should be no room for doubt. Everyone should know what he has to do when the case arises. Turning now to the consideration of the conduct to be observed in attack, it is clear that here also the same fundamental ideas apply as with the Infantry. Dismounted Cavalry must be prepared to work their way up to decisive distances, to break down from this limit the enemy's resistance, and finally to carry the position by storm. Hence the fighting line has need of constant reinforcements to give the necessary forward impulse, and hence we require the same distribution in regard to 'depth.' Nevertheless, it would be a great mistake to adopt on this point any stereotyped formation. It must not be overlooked that the essence of such Cavalry attacks is rapidity of execution. Hence in all cases where this necessity for rapidity arises the endeavour must be made to bring from the very first as many rifles into the firing line as possible, and it follows that the greater the fire power thus obtained the less the need for subsequent reinforcement.