'Thousands' in the Bible

Solomon addressed the entire nation of Israel, including the commanders of thousands and hundreds, the judges, all the other leaders of Israel, and all of the heads of the ancestral houses of Israel.

Here's how they were mustered, listed according to their ancestral houses and listed by commanders of thousands: Adnah commanded 300,000 elite forces.

Amaziah gathered Judah together and organized them according to their ancestral households under commanders of thousands and hundreds throughout Judah and Benjamin. He then mustered an army from those who were 20 years old and older. He discovered that there were 300,000 elite soldiers qualified for war duty and capable of handling spears and shields.