When the new set of guards arrived to replace those who had watched over Peter during the last section of the night, they discovered their fellow guards asleep with Peter having escaped. The guards who are woken up have no recollection of what has happened and there is a lot of commotion as a result. The Roman guards would be frightened because they know that their life is forfeit if a prisoner escapes (see Acts 16:27; Acts 27:42).1
18 Quand il fit jour, les soldats furent dans une grande agitation, pour savoir ce que Pierre était devenu.