The great Battle of Mount Zemaraim was reported in the Bible to have been fought in Mount Zemaraim, when the army of the Kingdom of Israel led by the king Jeroboam I encountered the army of the Kingdom of Judah led by the king Abijah I. About 500,000 Israelites were said to have lain dead after this single engagement, though most modern commentators consider the numbers to be either wildly exaggerated or symbolic, and some have even questioned its fundamental historicity. Wikipedia