What to Fire At
When the enemy makes his attack you will generally fire at those who appear in the sector that has been allotted to you to cover. You may, however, abandon your target on your own initiative under the following circumstances and fire:
1. On officers and non-commissioned officers. These can be recognized by their gestures. They are generally in the center of groups and get up and start first. They should be disabled, as this is the surest way of breaking up the attack.
2. At a group on the move. Fire should be concentrated on an advancing group. The time when the group is preparing to start its rush may be indicated by rifles being raised and the movements that take place along the line. After a rush has started, look out for the late comers trying to rejoin their comrades. They make good targets.
3. When the enemy attempts to build up his line to the front by a process of infiltration, that is, by having single men crawl from one point to the other, each man should be fired on during his advance.
4. Fire will be immediately concentrated on any machine gun that comes into action. With the German gun prolonged firing heats the water in the jacket to the boiling point and puffs of steam are given off. Do not be deceived into thinking that this necessarily gives away the position of the gun, for this steam has been piped to a distant place and allowed to escape so as to draw fire that otherwise might be directed on the real position of the gun.
5. On signallers or runners. These are carrying information that will probably be of benefit to the enemy's commander. You will appreciate the necessity of preventing this.
6. On an enemy showing a flank. No opportunity must be lost to fire upon an enemy that exposes his flank. The fire of a single rifleman down the flank may cause a whole line to retreat.
Use of Rifle Grenades