Asa had an army of 300,000 Judeans who were armed with large shields and spears and 280,000 Benjaminites who were armed with small shields and bows. All of these men were good fighting men.
When Rehoboam came to Jerusalem, he gathered the people of Judah and Benjamin, 180,000 of the best soldiers, to fight against Israel and return the kingdom to Rehoboam.
Abijah prepared for battle with an army of 400,000 of the best soldiers, while Jeroboam arranged to oppose him with 800,000 of the best professional soldiers.
Amaziah called the people of Judah together and assigned them by families to regiment and battalion commanders for all of Judah and Benjamin. He organized those who were at least 20 years old and found that he had 300,000 of the best men for the army, those who could handle a spear and a shield.