Yahweh speaks to the people of Babylon. This can be made clear. Alternate translation: "See, people of Babylon, a people is coming" (See: [[rc://en/ta/man/translate/figs-explicit]])
This phrase refers to the time when the Medes and Persians conquered Babylon in 539 BC. Here "nation" represents their armies. Alternate translation: "the armies of a great nation and many kings" (See: [[rc://en/ta/man/translate/figs-synecdoche]])
Being "stirred up" represents being urged to take action. Alternate translation: "are preparing to come from the most distant places on earth" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-activepassive]])