With regard to these exercises, I would point out that defensive screening, combined with natural obstacles, and possibly with the assistance of the other arms, is much more effective than the offensive method, and therefore deserves more attention, and, further, that there is a considerable difference between a reconnaissance and an offensive screen. In a reconnaissance an advance is made in the direction which the army commander considers to be most important, and it is left to the enemy's cavalry to oppose this advance. In offensive screening, on the other hand, the enemy must be found before he can be attacked and beaten. An advance would naturally not be risked in a direction that would avoid the enemy's cavalry, and thereby afford it the opportunity of approach against the main army. This should be prevented at all costs. An advance must consequently not be made until information has been obtained from patrols or scouts regarding the position and the line of advance of the enemy's cavalry. Then a determined attack should be made on the cavalry, the force being concentrated as much as possible for this purpose. It is only after this attack has been successfully carried out that the real screening work begins. The two main points that should be observed when carrying out such exercises are therefore: (1) no advance should be made until the enemy's line of advance has been discovered; and (2) the forces should be distributed, after the defeat of the enemy, on a broad front, in accordance with the requirements of the screening duties, while the enemy's beaten cavalry must be carefully watched, to prevent its further activity. With regard to defensive screening, it is necessary above all, first, to occupy with sufficient strength all passages over the natural obstacle that has been selected, and to effect a tactical disposition of the forces that will enable them to do a maximum of work with the expenditure of a minimum of strength, making the greatest possible use of field entrenchments; secondly, to so dispose the reserves that they will be quickly available to strengthen any threatened point; and lastly, to arrange a system of communication along the whole screening-line, employing any suitable technical appliances in such a manner that the system will continue to operate even though the enemy's patrol should break through the line. It must be possible also to communicate quickly and safely to the troops in rear, so that any detachments of the enemy that might break through the line may be intercepted. The cavalry telegraph, in fact any kind of telegraph, is the least sure method of communication, particularly in the enemy's country, owing to the ease with which it can be cut. There must, at any rate, be other means of rapid communication besides the telegraph, such as flag signals or the light-signal.