In Colossians, the apostle Paul is laying out good information to refute disinformation. He shows that Christ did everything, including disarming our spiritual foes at the cross. This does not mean the enemy became powerless. It means the cross has made their fate definite: their end will come. Until that day comes, we must keep fighting the fight of faith. As Christ got the victory, so shall we.

"Our Spiritual Foes Disarmed at the Cross” Study Notes VF-2290