Let all mine enemies. — Better rendered either by the present or future. The Psalmist with the eye of faith sees the answer to his prayer.
Return — i.e., retire discomfited and in failure.
“My enemies shall all be blank, and dasht
With much confusion: then grow red with shame;
They shall return in haste the way they came,
And in a moment shall be quite abashed.” —
Milton’s trans.