Ehud “went down” from the mountain of Ephraim into the Jordan valley beneath it, straight to the Jordan fords Joshua 2:7, so as to intercept all communication between the Moabites on the west side and their countrymen on the east.
Related Commentaries of Judges 3:28
Judges 3:28
28 And he said unto them, Follow after me: for the LORD hath delivered your enemies the Moabites into your hand. And they went down after him, and took the fords of Jordan toward Moab, and suffered not a man to pass over.