Bede

And he had bronze greaves on his legs, etc. Helmet, mail, shield, and greaves, are different types of arguments or reasoning methods, by which the devil rebelling against the Lord, or defending the foolishness of his own head, namely, all the wicked, or his miserable body, attempts to defend. For he covers the head of sin, when, even condemned, he does not fear to say and be believed to be God. He also covers the body when the heart of the wicked inclines to the evil word, to excuse excuses in sins. …

Commentary on Samuel ↗