Albert Barnes Commentary Psalms 18:37

"I will pursue mine enemies, and overtake them; Neither will I turn again till they are consumed." — Psalms 18:37 (ASV)

I have pursued mine enemies, and overtaken them - He had not only routed them, but had had strength to pursue them; he had not only pursued them, but he had been enabled to come up to them. The idea is that of complete success and absolute triumph.

Neither did I turn again - I was not driven back, nor was I weary and exhausted, and compelled to give up the pursuit.

Till they were consumed - Until they were all either slain or made captive, so that the hostile forces vanished. None of my enemies were left.