Here Yahweh speaks of allowing the armies from the east to conquer Ammon as if Ammon were a possession that he was giving them. Alternate translation: "I will allow the armies to conquer them" (See: [[rc://en/ta/man/translate/figs-metaphor]])
This can be stated in active form. Alternate translation: "so that the nations will not remember the people of Ammon" (See: [[rc://en/ta/man/translate/figs-activepassive]])