Upon the walls of Babylon - Or, “against the walls.” The King James Version takes the word ironically, as a summons to Babylon to prepare for her defense; others take it as a summons to the army to make the attack.
Related Commentaries of Jeremiah 51:12
Jeremiah 51:12
12 Set up the standard upon the walls of Babylon, make the watch strong, set up the watchmen, prepare the ambushes:c for the LORD hath both devised and done that which he spake against the inhabitants of Babylon.