2CH 25:5

5 Amaziah summoned the men of [the tribes of] Judah and Benjamin to come to Jerusalem, and there he put them in groups, each clan in a group by themselves. Then he appointed officers to command each group. Some officers commanded 100 men and some commanded 1,000 men. They counted the men who were at least 20 years old; altogether there were 300,000 men. They were all men who were prepared to be in the army, and able to [fight well,] using spears and shields.