Jeremiah 51:20

Or, Thou art my maul, weapons of war etc. The maul or mace Proverbs 25:18 only differs from the hammer Jeremiah 50:23 in being used for warlike purposes.

Omit the “will” in “will I break.” The crushing of the nations was going on at the time when the prophet wrote. Most commentators consider that Babylon was the mace of God.