forsaken bough - rather “the leavings of woods,” what the axeman leaves when he cuts down the grove (compare Isa 17:6).
which they left because of - rather, “which (the enemies) shall leave for the children of Israel”; literally, “shall leave (in departing) from before the face of the children of Israel” [Maurer]. But a few cities out of many shall be left to Israel, by the purpose of God, executed by the Assyrian.