As King David wrote Psalm 18, he faced human foes; we more often face the unseen ones of the devil and his minions. However, the reality of the battle is the same and the One who vanquishes the enemy is also the same. 

As we follow you, Lord Jesus, our Warrior King, I praise you that in the spiritual battle before us, our true enemies, Satan and His hordes, will be defeated as we submit to and trust in you, joining you in what you are doing. Then we can say with David,

Psalm 18:37 [By keeping on the armor of God] “I pursued my enemies [Satan and his demons] and overtook them; I did not turn back till they were destroyed [by praise, prayer and persistence in obedience].

18:38 I crushed them [with the Word of God] so that they could not rise; they fell beneath my feet” [because I joined God in what He is doing].

[This is possible, Lord Jesus, because]

18:39-41 “You armed me with strength for battle; you made my adversaries bow at my feet. You made my [spiritual] enemies turn their backs in flight, and [in your power] I destroyed my foes [Satan’s servants]. They cried for help, but there was no one to save them—to the LORD, but he did not answer [for they had rejected Him and His ways].

And so it is when we keep on the armor of God and fight the enemy with praise, prayer and persistence in obedience. Praise be to God for His provision in the battle.