Charles Ellicott Commentary Jeremiah 46:5

"Wherefore have I seen it? they are dismayed and are turned backward; and their mighty ones are beaten down, and are fled apace, and look not back: terror is on every side, saith Jehovah." — Jeremiah 46:5 (ASV)

Wherefore have I seen them dismayed ...? —The prophet speaks as seeing already in his mind’s eye the confusion of the defeated army, with no way to escape, driven back on the Euphrates. In fear round about (Magor-missabib) we have one of his characteristic formulæ (Jeremiah 6:25; Jeremiah 20:3; Jeremiah 20:10; Jeremiah 49:29).