It does not appear advisable under such circumstances to unite all the available cavalry on one wing. It is certainly obvious that its main strength must be concentrated in what is considered the decisive direction, in order that it may be as strong as possible on the field of battle. This desire, however, should not go so far as to denude one flank wholly of cavalry. This flank would then be completely laid bare to the enemy's observation, and would itself be deprived of the possibility of ascertaining what was going on on the enemy's side. It is much more advisable to provide upon each flank a centre of reconnaissance, even if such consists of quite a weak detachment of cavalry, which will act as a reserve for patrols and a reporting centre. The offensive cannot, of course, be undertaken on the flank where the cavalry is weak, but reconnaissance must be carried out by patrols of scouts, and other action limited generally to keeping the enemy's patrols at a distance. III. THE SCREEN The idea of the screen is first touched on in the "Field Service Manual" of 1908; it is also, however, demanded by the conditions of modern war. For however important it may be to gain early intelligence as to the enemy in order thereby to be able to make the necessary dispositions, it is naturally just as important to deprive him of this advantage. Reflection and experience have shown that although the measures of reconnaissance considerably assist the screening if the enemy's cavalry is defeated, they are not of themselves sufficient to secure the army from hostile observation. The "Field Service Manual" sums up, I think, the chief considerations as regards screening, for the most part to the point, especially where it deals with the defensive screen. There are no war experiences in modern times of this matter, and, according to my opinion, peace experiences are not comprehensive enough to allow of any appreciable amplification of the "Field Service Manual." At the same time I would draw attention to some of the points which give occasion for further research and reflection.