And her settlements on the mainland will be ravaged by the sword. Then they will know that I am the LORD.
NIV
And Tyre's daughters [her towns and villages on the mainland] in the level place shall be slain by the sword, and they shall know (understand and realize) that I am the Lord [the Sovereign Ruler, Who calls forth loyalty and obedient service].
AMP
And her daughters which are in the field shall be slain by the sword; and they shall know that I am the LORD.
KJV