You have enlarged the nations and increased their joy;
they rejoice before you as people rejoice at the harvest,
as men rejoice when dividing the plunder.
What Isaiah sees aren’t these insignificant tribes crumbling under military pressure. He doesn’t see them oppressed; neither does he see them oppressing. Instead, he sees them liberated and liberating in a joyful kind of way. The people had already seen how the military forces came in and destroyed the nations. But now, Isaiah gives them the picture of the day that will come when the Perfect Prince Himself will bring exceptional peace.