(_b_) Discipline in the Trenches:—Life in the trenches is not especially dangerous when all precautions are observed. In the presence of an alert enemy, every faulty move of disposition receives its punishment, such as the improper concealment of a movement, poorly hidden trench work, or useless noise in the firing line. Silence is one of the essential rules of the trench. Silence in a sector in which troops are properly disciplined enables the chief to rapidly transmit his orders and the men to accomplish same without delay. Daily Reports:—In each sector, from the captain up, the different commanders must furnish a daily report. These are co-ordinated in the headquarters of the sector commander, and afterwards sent to the division headquarters. (_a_) Telephone Reports:— Night report. 5 a. m. to 7 a. m. Day report. 3 p. m. to 5 p. m. These reports contain the main events of the time covered. Similar messages are sent at any time important events occur, such as heavy shelling, important information of the enemy, activities in the air, etc. (_b_) Written Reports:—The daily morning written reports contain the following paragraphs. 1. General aspect of the sector. 2. Important events of the day. (The events must be reported in detail, for example: A report of shelling must contain the details as to the area bombarded, the caliber of the gun used, and the time and direction of same, etc.) 3. Casualties (wounded, killed, and missing). 4. Consumption of ammunition. 5. Requests for miscellaneous equipment and material. This report is signed by the chiefs of the area responsible for the information in the report. Along with this official report is added a second written report with the following paragraphs: 1. Request for materials for the night. 2. Observation and information reports (to the Intelligence Officer). 3. Report of all the work done in the sector, including time schedule of the center of resistance. Use of Infantry and Artillery Weapons, and Liaison =Machine Guns.= The tactical use and location of machine guns in the sector depends upon the following two points: (_a_) Machine gun emplacements must be thoroughly concealed and during the bombardment the M. G. itself is kept under cover in a dugout. Previous to an attack of the enemy, his artillery searches the position for the destruction of the machine guns and their emplacements, because they are the most powerful weapons of the defense.