seven in the evening
On the night before camp broke up , a second incident of a sensational kind occurred , which , but for the fact that they never heard of it , would have given the schools a good deal to talk about . It happened that Kennedy was on sentry-go that night . The manner of sentry-go is thus . At seven in the evening the guard falls in , and patrols the fringe of the camp in relays till seven in the morning . A guard consists of a sergeant , a corporal , and ten men . They are on duty for two hours at a time , with intervals of four hours between each spell , in which intervals they sleep the sleep of tired men in the guard-tent , unless , as happened on the occasion previously described , some miscreant takes it upon himself to loose the ropes . The ground to be patrolled by the sentries is divided into three parts , each of which is entrusted to one man .