Albert Barnes Commentary Psalms 144:6

"Cast forth lightning, and scatter them; Send out thine arrows, and discomfit them." — Psalms 144:6 (ASV)

Cast forth lightnings, and scatter them - See the notes at (Psalms 18:14): He sent out his arrows, and scattered them. The allusion there is to lightning. The psalmist prays that God would now do again what he had then done. The Hebrew here is, “Lighten lightning;” that is, Send forth lightning. The word is used as a verb nowhere else.

Shoot out your arrows ... - So in (Psalms 18:14): He shot out lightnings. The words are the same here as in that psalm, only that they are arranged differently. See the notes at that place.