one after one
`` See , the bottom is evidently worn by feet . The passage must have been used for a long time ; but it 's an awkward place to follow desperate men into . '' `` It is , indeed , '' Lieutenant Adcock agreed . `` They could shoot us down one after one as we go in . They would see us against the light , while we should be able to make out nothing . '' `` Surrender in there ! '' Captain O'Connor shouted .