Here "fall" means to die. And "sword" represents the enemies carrying weapons. Alternate translation: "Enemies will kill some of them and others will die of hunger" (See: [[rc://en/ta/man/jit/figs-idiom]] and [[rc://en/ta/man/jit/figs-metonymy]])
This is a way to refer to people from every social status. Here "least" and "greatest" represent those who are least important and those who are most important. Alternate translation: "all the people from every social status" or "all the people, including the least important and the most important people" (See: [[rc://en/ta/man/jit/figs-merism]])