For this is the day of the Lord GOD of hosts, a day of vengeance, that he may avenge him of his adversaries: and the sword shall devour, and it shall be satiate and made drunk with their blood: for the Lord GOD of hosts hath a sacrifice in the north country by the river Euphrates.
For this is ... a day of vengeance - for the slaughter of Josiah (2 Kings 23:29). The sword shall devour, and ... be ... drunk - poetical personification (Deuteronomy 32:42).
A sacrifice - typical of the last great destruction of the Lord's enemies at the Lord's second advent, which is described in the same figurative language (Isaiah 34:6, "The sword of the Lord is filled with blood; it is made fat with fatness, and with the blood of lambs and goats, with the fat of the kidneys of rams: for the Lord hath a sacrifice in Bosrah (in Edom, type of the Antichristian confederacy), and a great slaughter in Idumea;" Ezekiel 39:17). The slaughter of the Egyptians is represented as a "sacrifice" to satiate His righteous vengeance.