The first part of this verse states the opposite of verse 7; the Israelites will be defeated by their enemies, and not the other way round.

Go out … against them: that is, march out from their towns and go to war against their enemies.

You shall be a horror to all the kingdoms of the earth: that is, all the people of the world will be horrified at what will happen to the Israelites (see verse 37; see also Jer 15.4; 24.9). New Jerusalem Bible has “a terrifying object lesson,” Good News Translation “will be terrified when they see what happens to you,” and Contemporary English Version “a horrible sight for…”; or we may say “when the other nations on earth see what happens to you, they will be terrified.”

All the kingdoms of the earth: a way of saying “all the people in the world.”

Quoted with permission from Bratcher, Robert G. and Hatton, Howard A. A Handbook on Deuteronomy. (UBS Helps for Translators). New York: UBS, 2000. For this and other handbooks for translators see here .