Before the attack, the physiognomy of the terrain and of the enemy’s defenses should be well impressed on the memory. The position should be known not only from the front but in profile. This study is of the greatest importance, particularly _for the troops of the second line_, because the greatest cause of stoppage in an offensive against a fortified position is the incomplete knowledge of the position. One is afraid, in advancing, of falling into an ambush. The company commanders, particularly those of the first line, should indicate to their chiefs of section the successive points of direction for their sections, so that each one will be aware of the obstacles he will have to cross. The men should likewise know the ground well. I used to require them to study the future sector of attack, giving them the principal points to watch when they went on guard in the trench. If on the 4th of December we had known the terrain of attack before the night engagement instead of not having the slightest notion of it, we would not have awaited the dawn at the first German trench for fear of falling into a wasps’ nest, and we should have taken not only the second but the third trench and made many prisoners. Very detailed maps are distributed before the attack to company commanders and to chiefs of section, but one should try to complete them oneself by attentive and repeated observation of one’s sector. Before the attack of the 9th of May, I had recopied for each noncommissioned officer the part of my map concerning the zone of attack of the company, entering on it all known information. _Matériel._ Real superiority over the enemy is obtained by superiority of weapons; courage cannot make up for destruction, one must tax one’s brain to furnish the men with matériel which may be useful to them. _Grenades._—Every grenadier or member of a patrol should carry five grenades; each man should have one, not to throw himself but so that it may be possible to get a certain number of them together in case of need. If a fight with grenades is foreseen in a region cut up with trenches or _boyaux_ or in a town, the supply should be increased. Furnish suffocating grenades, especially to patrols going into _boyaux_. Familiarize everyone a long time beforehand, if possible, with the handling of the different grenades. On the 8th of May, I sent 5 kilometres for suffocating grenades, which I had just heard of, in order to be acquainted with the effects of this useful weapon. Have hooks prepared, fixed to the left wrist, for the purpose of lighting the friction grenades by hand. Revolvers and knives are indispensable for the fight in the _boyaux_. Have individual sand bags to establish a rapid barrier in the _boyaux_ or to build up a line of cover such as we have before described. Also the Filloux apparatus, with the use of which the men should be familiar.