When the next rush is made, say by squads, where do these reinforcements go? In one regiment at least, they solved it satisfactorily. The points of division along the firing line remain where they were; the new man who joins the firing line always goes with the man on his right, he belongs to the squad and to the platoon of the man on his right. This provision should be added in the I. D. R. [Sidenote: Mixing on the firing line] In teaching the mechanism of the extended order, practice should be had in this by dividing the company into firing line and support and then feeding in the support and continuing the advance by rushes. If you expect this to be done in battle it must become a habit. To get the best practice in this mixing, as well as to train officers and sergeants to think quickly and to act properly, there should be many rencontre engagements so planned as to bring about a mixing of units on the firing line. [Sidenote: Practice at war strength] Some practice should be afforded with companies at war strength. This can be had by combining two or more companies. By this means it is sought to accustom officers to the fronts and depths of such a company and also to the greater length of time required to change formation. [Sidenote: Redistributing the target] In combat exercises of the company alone practice must be had in shifting part of the fire to new targets and redistributing the old. In large battles this will seldom if ever be required by men in the firing line, but it will occur in detachment work. The companies should get practice in this and it can be well coupled with the instruction in hasty deployments suggested on page 46. [Sidenote: Work on the defensive] Some work should be done on the defensive. A few men should be detailed to represent the enemy; if the man carries one little flag he represents a squad, if two flags a platoon. These men should be in charge of a competent man who as nearly as is practicable directs their advance as such units would really advance under the assumed conditions. Enveloping movements and surprise attacks can thus be well simulated, giving the company the opportunity to practice meeting such movements by the use of the support, redistribution of targets, etc. [Sidenote: Company against company] The instruction against an outlined enemy having been practiced until the companies are well instructed, the enemy should be represented, one company should work against another. This gives an opportunity for reconnaissance work before and during the attack and introduces the elements of uncertainty as to what the enemy will do. [Sidenote: Night operations]