Wherefore have I seen them dismayed and turned away back? and their mighty ones are beaten down, and are fled apace, and look not back: for fear was round about, saith the LORD.
Wherefore have I seen them dismayed (note, Jeremiah 46:3). The language of astonishment that an army so well equipped should be driven back in "dismay." The prophet sees this in prophetic vision.
Fled apace - literally, fled a flight, i:e., flee precipitately.
Look not back - they do not even dare to look back at their pursuers.