Jamieson, Fausset and Brown on Song of Solomon 3:8

8. hold--not actually grasping them, but having them girt on the thigh ready for use, like their Lord (Psa 45:3). So believers too are guarded by angels (Psa 91:11; He 1:14), and they themselves need "every man" (Ne 4:18) to be armed (Psa 144:1, 2; 2Co 10:4; Ep 6:12, 17; 1Ti 6:12), and "expert" (2Co 2:11).

because of fear in the night--Arab marauders often turn a wedding into mourning by a night attack. So the bridal procession of saints in the night of this wilderness is the chief object of Satan's assault.