If we can overlook the treachery and violence which belonged to the morals of the age and country, and bear in mind Jael’s ardent sympathies with the oppressed people of God, her faith in the right of Israel to possess the land in which they were now slaves, her zeal for the glory of Yahweh as against the gods of Canaan, and the heroic courage and firmness with which she executed her deadly purpose, we shall be ready to yield to her the praise which is her due. See Judges 3:30 note.
Related Commentaries of Judges 4:21
Judges 4:21
21 Then Jael Heber's wife took a nail of the tent, and tookd an hammer in her hand, and went softly unto him, and smote the nail into his temples, and fastened it into the ground: for he was fast asleep and weary. So he died.