I believe that those that oppose Israel and her people will suffer greatly.
I think only the King James Version renders it this way (I’d have to look at other versions again):
(God speaking) “I will leave but the sixth part of thee”.
Approximately 16.6%. By the time Ezekiel 39 comes to pass.
Ezekiel 39:2 King James Version
2 And I will turn thee back, and leave but the sixth part of thee, and will cause thee to come up from the north parts, and will bring thee upon the mountains of Israel: