Psalm 18:50 NKJV

Great deliverance He gives to His king, and shows mercy to His anointed, to David and his descendants forevermore.

David had confidence in God granting him deliverance from all his enemies. As king, he had to engage in battle from time to time. He expected to win because the King of kings was his God. Notice David said that God gave deliverance to His king. The Lord made him king. One of the benefits God provided for his kings was deliverance from all enemies. According to Revelation 1:6, Jesus made us kings. So we should expect deliverance from all our enemies. We are created to be winners – more than conquerors through Christ who loved us and gave Himself for us.