“You will fall on the mountains of Israel, you, and all your hordes, and the peoples who are with you, and I will give you to the ravenous birds of every kind, and to the beasts of the field, to be devoured. You will fall on the open field, for I have spoken it, says the Lord Yahweh.”
The mountains of Israel were the backbone of Israel. They were its strength, but they were also the site of Israel's abominations. Thus the hordes of darkness would be broken on them, and it was fitting that those mountains that had been used for idolatry and sinful abominations, should now be the recipient of the dead bodies of those evil hordes, just as previously they had received the bodies of the slain when God punished Israel (Ezekiel 6:5; Ezekiel 6:13).
‘And I will give you to the ravenous birds of every kind, and to the beasts of the field, to be devoured.' Compare Ezekiel 32:4; Ezekiel 29:5; Ezekiel 31:13; Jeremiah 7:33; Jeremiah 16:4; Jeremiah 19:7; Jeremiah 34:20. See also Revelation 19:21. This was considered to be an horrific death (see Psalms 79:2). Left unburied to have their bodies mauled and their bones picked by scavenging bird and scavenging beast.
‘You will fall on the open field.' The open field was the description given to areas away from cities, outside in the open away from men's dwellings (Ezekiel 16:5; Ezekiel 29:5; Ezekiel 32:4; Ezekiel 33:27 (where it parallels ‘wastes'); see also Lev 14:7; 2 Samuel 11:11; Numbers 19:16; Jeremiah 9:22). Their mission to capture the cities of Israel will have proved a total failure. God's people will be safe.
‘For I have spoken it, says the Lord Yahweh.' Their destruction will occur because God has said it and determined it.