midnight
They watched it in silence until it died down and nothing remained but a faint glare . `` Let 's go to bed , '' said Charley at last . `` If they are on the chief 's island , they will not bother us to-night . '' But after a short discussion , it was decided to stand guard and watch , Charley and Walter to stand on guard until midnight , and then to be relieved by Chris and the captain . The two sentinels climbed up on a portion of the wall that lay in the shadow of a big tree and from which they could command a good view of the rest of the wall and inclosure itself . `` I have been thinking that the unsavory reputation of this island may keep those fellows from coming here , '' Walter observed in an undertone . `` It will likely keep Indian Charley away , and I am more afraid of him than all the balance .