New Living Translation
You may only cut down trees that you know are not valuable for food. Use them to make the equipment you need to attack the enemy town until it falls.

American Standard Version
Only the trees of which thou knowest that they are not trees for food, thou shalt destroy and cut them down; and thou shalt build bulwarks against the city that maketh war with thee, until it fall.

Berean Study Bible
But you may destroy the trees that you know do not produce fruit. Use them to build siege works against the city that is waging war against you, until it falls.

Douay-Rheims Bible
But if there be any trees that are not fruitful, but wild, and fit for other uses, cut them down, and make engines, until thou take the city, which fighteth against thee.

English Revised Version
Only the trees which thou knowest that they be not trees for meat, thou shalt destroy and cut them down; and thou shalt build bulwarks against the city that maketh war with thee, until it fall.

King James Bible
Only the trees which thou knowest that they be not trees for meat, thou shalt destroy and cut them down; and thou shalt build bulwarks against the city that maketh war with thee, until it be subdued.

World English Bible
Only the trees of which you know that they are not trees for food, you shall destroy and cut them down; and you shall build bulwarks against the city that makes war with you, until it fall.

Young's Literal Translation
Only, the tree, which thou knowest that it is not a fruit-tree, it thou dost destroy, and hast cut down, and hast built a bulwark against the city which is making with thee war till thou hast subdued it.

Deuteronomy 20:20 Additional Translations ...