What does Isaiah 18:6 mean?
Isaiah has described the nations of the world waiting for God to act against the relentless Assyrian Empire, which has brought death and suffering to the world. He has described the Lord waiting for the precise moment to "prune" the Assyrians away, and that moment had not yet come (Isaiah 18:3–4).Here, the metaphor of pruned branches (Isaiah 18:5) transforms into the grisly picture of dead corpses. There will be so many bodies that the birds of prey and predators on the ground will feast on them. The birds will have food all summer long, and the beasts will not go hungry that winter. The prophet assures all who hear him that this moment will come. When the Lord is finished using the Assyrians to bring judgment on His people Israel and other nations, He will turn and end their reign of terror on earth (Isaiah 10:12, 25).
The scene Isaiah pictures here—endless piles of bodies feeding wild animals—likely points forward to a specific moment in time. Lead by the fearsome Sennacherib, the Assyrians will lay siege to Jerusalem. The people in the city will have little hope of survival. That's when the time will be right for the Lord's judgement on Assyria. The angel of the Lord will kill thousands upon thousands of their soldiers in one night. This signals the beginning of the end for their dominance in the region (Isaiah 37:36–38).