375. When the men of two or more units intermingle in the firing line, all officers and men submit at once to the senior. Officers and platoon guides seek to fill vacancies caused by casualties. Each seizes any opportunity to exercise the functions consistent with his grade, and all assist in the maintenance of order and control.
Every lull in the action should be utilized for as complete restoration of order in the firing line as the ground or other conditions permit.
376. Any officer or noncommissioned officer who becomes separated from his proper unit and can not rejoin must at once place himself and his command at the disposal of the nearest higher commander.
Anyone having completed an assigned task must seek to rejoin his proper command. Failing in this, he should join the nearest troops engaged with the enemy.
377. Soldiers are taught the necessity of remaining with their companies, but those who become detached must join the nearest company and serve with it until the battle is over or reorganization is ordered.
378. Commands are deployed and enter the combat by the orders of the commander to the subordinate commanders.
The initial combat orders of the division are almost invariably written; those of the brigade are generally so. The written order is preferable and is used whenever time permits.
If time permits, subsequent orders are likewise written, either as field orders or messages.
379. The initial combat orders of regiments and smaller units are given verbally. For this purpose the subordinates for whom the orders are intended are assembled, if practicable, at a place from which the situation and plan can be explained.
Subsequent orders are verbal or in the form of verbal or written messages. Verbal messages should not be used unless they are short and unmistakable.
380. The initial combat order of any commander or subordinate is based upon his definite plan for executing the task confronting him.
Whenever possible the formation of the plan is preceded by a personal reconnaissance of the terrain and a careful consideration of all information of the enemy.
381. The combat order gives such information of the enemy and of neighboring or supporting friendly troops as will enable subordinates to understand the situation.