Here "hand" represents the control of the king of the South. AT: "the king will surrender the army to the king of the South" (See: [[rc://en/ta/man/translate/figs-activepassive]] and [[rc://en/ta/man/translate/figs-metaphor]])
This may be expressed in active form. AT: "The king of the South will capture the army of the North" (See: [[rc://en/ta/man/translate/figs-activepassive]])
Here falling represents dying in battle. AT: "will have his army kill many thousands of his enemies" or "will kill many thousands of his enemies" (See: [[rc://en/ta/man/translate/figs-metonymy]])