Commentaries:
Jamieson, Fausset, and Brown
Heshbon . . . Ai—Nebuchadnezzar, coming from the north, first attacked Ammon, then its brother and neighbor, Moab. As Ai of Ammon had already suffered destruction, Heshbon of Moab being near it might well fear the same fate.
hedges—Their cities being destroyed, the outcasts have no place of shelter save behind the "hedges" of vineyards and gardens; or else the enclosures of their villages.
their king—Melchom, the idol, as the mention of "his priests" shows (compare Jeremiah 48:7).
Other Jamieson, Fausset, and Brown entries containing Jeremiah 49:3:
Isaiah 46:1
Jeremiah 47:7
Jeremiah 48:47
Amos 1:15
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