=124.= Should a sentinel call "=The Guard=," the corporal will promptly notify the commander of the guard. =125.= Should a sentinel call "=Relief=," the corporal will at once proceed to the post of such sentinel, taking with him the man next for duty on that post. If the sentinel is relieved for a short time only, the corporal will again post him as soon as the necessity for his relief ceases. =126.= When the countersign is used, the corporal at the posting of the relief during whose tour challenging is to begin gives the countersign to the members of the relief, excepting those posted at the guardhouse. =127.= He will wake the corporal whose relief is next on post in time for the latter to verify the prisoners, form his relief, and post it at the proper hour. =128.= Should the guard be turned out, each corporal will call his own relief, and cause its members to fall in promptly. =129.= Tents or bunks in the same vicinity will be designated for the reliefs so that all the members of each relief may, if necessary, be found and turned out by the corporal in the least time and with the least confusion. =130.= When challenged by a sentinel while posting his relief, the corporal commands: 1. =Relief=, 2. =HALT=; to the sentinel's challenge he answers "=Relief=," and at the order of the sentinel he advances alone to give the countersign, or to be recognized. When the sentinel says, "=Advance relief=," the corporal commands: 1. =Forward=, 2. =MARCH.= If to be relieved, the sentinel is then relieved as prescribed. =131.= Between retreat and reveille, the corporal of the guard will challenge all suspicious looking persons or parties he may observe, first halting his patrol or relief, if either be with him. He will advance them in the same manner that sentinels on post advance like parties (Pars. 191 to 197), but if the route of a patrol is on a continuous chain of sentinels, he should not challenge persons coming near him unless he has reason to believe that they have eluded the vigilance of sentinels. =132.= Between retreat and reveille, whenever so ordered by an officer entitled to inspect the guard, the corporal will call: "=Turn out the guard=," announcing the title of the officer, and then, if not otherwise ordered, he will salute and return to his post. =133.= As a general rule he will advance parties approaching the guard at night in the same manner that sentinels on post advance like parties. Thus, the sentinel at the guardhouse challenges and repeats the answer to the corporal, as prescribed hereafter (Par. 200); the corporal, advancing at port arms, says: "=Advance (so-and-so) with the countersign=," or "=to be recognized=," if there be no countersign used; the countersign being correctly given, or the party being duly recognized, the corporal says: "=Advance (so-and-so)=," repeating the answer to the challenge of the sentinel.