The king traveled into battle. He surrounded himself with his strongest men. He rode on the most elite chariot. He thought that because he had the best protection available he had nothing to fear. He was killed. The enemy surpassed all of the security and destroyed him.
The king had misplaced his hope and trust. He had put stock in the things he could come up with instead of The Lord.
God is the deliverer of the soul. He is the one who saves His people. He watches each step. Be careful of what you put your trust in. Jesus is the only true security available in this world.