When Rehoboam arrived in Jerusalem, he mobilized the house of Judah and Benjamin—180,000 chosen warriors—to fight against Israel and restore the kingdom to Rehoboam.
Jewish Publication Society of America Version (JPS1917) - 2 Chronicles 11:1 >And when Rehoboam was come to Jerusalem, he assembled the house of Judah and Benjamin, a hundred and fourscore thousand chosen men, that were warriors, to fight against Israel, to bring the kingdom back to Rehoboam.