In the meantime, at the command post of the support point, the new captain acquaints himself with all information and orders pertaining to the support point from the old captain. When this is finished he telephones the command post of the center of resistance the completion of the relief, and asks if his predecessor may retire. The relieved company then takes up the march, following the prescribed route up to the assembly point of the battalion. It may be stated here that the relieved units must leave their trenches in as clean and sanitary a condition as possible. The work of clearing up the shelters and latrines must be thoroughly done before the arrival of the new units. Depots must be left in good condition and contain the amount of supplies called for by regulations. The platoon commander is responsible that his men do not forget, tools and cooking utensils in the trenches. =Duties after the Relief.= In each support point, the new captain immediately establishes liaison with the command posts of the neighboring units to right and left. Communication between the captain and his battalion commander is obtained by means of the two messengers detailed to the battalion for that purpose and who now return to their company. When the battalion commander has received the information from all his captains that the relief of his area is finished, he reports the same by telephone to his colonel. A confirmation of this report will be made the next morning in his daily written report which will cover the following points: The general condition of the relief. Hour of completion of the relief. Casualties during the relief. Living conditions in the trenches. Requests for tactical modifications (new dispositions of the garrison). The relief finished, the battalion commander must also establish his liaison laterally and to the front and rear, but especially with his artillery support, by means of the artillery N. C. O. detailed to his area for that purpose. Finally, the battalion commander investigates and perfects the organization of the food supply. In the sector headquarters, the new sector commander will find on file all records, reports, orders, and detailed information concerning all the elements of defense of the sector. The sector file will contain the following documents: Plan of organization. Plan of defense. Files of information concerning: Machine guns. Trench mortars. Artillery support (table of barrages and other fires). Liaison (telephones, runners, signalling, etc.). Supply and evacuation. Measures to combat gas attacks. Besides these are the files of the different reports: Sector daily reports (kept by the adjutant). Intelligence reports (kept by the intelligence officer). Construction reports (kept by the engineer officer). Maps, sketches, and aëroplane photographs (kept by int. officer). Inventory of the sector depot (kept by engineer officer).