Text They had marched all the previous day and night and were resting.At nightfall they would take to the road again,climb to the place where their unfaithful sentinel now slept,and descending the other slope of the ridge,fall upon a camp in the rear of it.(18 In case of (19 failure,their position would be perilous 20) in the extreme;and fail they surely would,should accident or vigilance apprise the enemy of the movement.(21 Text 课 文 They had marched all the previous day and night and were resting. At nightfall they would take to the road again, climb to the place where their unfaithful sentinel now slept, and descending the other slope of the ridge, fall upon a camp in the rear of it. (18) In case of (19)failure, their position would be perilous(20) in the extreme; and fail they surely would, should accident or vigilance apprise the enemy of the movement. (21)