twelve o'clock
` They 've set the time right at the siesta hour when everybody takes a nap . But the cannon will wake 'em up . Everything will be all right , depend upon it . ' `` Just at twelve o'clock we heard the sound of a cannon -- BOOM ! -- shaking the whole town . `` O'Connor loosens his sword in its scabbard and jumps for the door . I went as far as the door and stood in it .