midnight
`` Then tomorrow we must get him out , '' Stanley said . `` Will our two men be on duty ? '' `` Yes , master , they have not been on since the last night we were there . They will form the second watch , and will go on guard at midnight . I have bought two very sharp saws , and have cut two strong bamboos for the litter . '' This was constructed the next day . It was very simple , being formed by sewing a blanket strongly to the two bamboos .