9 When the officers have finished speaking to the army, they shall appoint commanders over it.

Read Deuteronomy 20:9 Using Other Translations

And it shall be, when the officers have made an end of speaking unto the people, that they shall make captains of the armies to lead the people.
And when the officers have finished speaking to the people, then commanders shall be appointed at the head of the people.
When the officers have finished speaking to their troops, they will appoint the unit commanders.