=Time.= If all the points in the enemy’s line to be attacked are thoroughly known and located, the raid can be carried out during the night. But if there is some lack of knowledge of the above mentioned points, the raid must be carried out at dusk or dawn, so that the objectives can be at least partly seen. =Disposition of the Groups to Cross the Barbed Wire; Disposition of the Troops before the Raid.= The distance of a raid should not be more than fifty yards. For this purpose, the different groups must get into position such a distance from the enemy’s lines either by silently crawling across “No Man’s Land” or by profiting by a short preliminary bombardment of a few minutes which will prevent the enemy’s sentinels and watchers from perceiving them. Their disposition is usually made by hiding or crouching in shell holes. =Destruction of the Barbed Wire.= The different ways of destroying barbed wire have been spoken of under Surprise Attacks in the chapter on Defense of a Position. =Signal of Departure.= Three methods can be used; previous designation of the hour, use of a whistle, or by means of a rocket. Of these, the last named is probably the best. There are two different kinds of groups in the raiding party. The flank groups, armed with hand grenades, protect the groups executing the raid proper by shutting off all avenues of approach of the enemy. Barricades are established by these groups by throwing grenades into the trenches leading to the attacked area. Between the flank groups, are the groups that carry out the proper mission of the raid. They are armed with incendiary grenades, pistols, and trench knives. Their function is to accomplish any particular destruction of their mission and to capture prisoners. =Infantry Supporting the Raid.= The riflemen of the garrison of the center of resistance stand ready at the firing parapets to receive the groups returning from the raid. The machine guns carry out an intense fire on the flanks of the point raided to prevent the approach of hostile reinforcements. The rifle grenadiers of the garrison execute fire upon special points on the flanks or on the rear of the raided area, such as machine gun emplacements, junction of boyaux, etc. =Support of the Artillery.= If artillery is used in conjunction with the raid, it may be employed before, during, or after the raid, or in any combination of these periods. During the raid, two kinds of fire are carried out, that of demolishing the barbed wire entanglements, and special elements of the hostile position that will hinder the raid. This is carried out by the light artillery and trench mortars, principally the latter.