2 Chronicles 13:3

And Abijah, apparently in an effort to regain the northern territory for the house of David, set the battle in array with an army of valiant men of war, experienced, veteran troops, even four hundred thousand chosen men, for most men in those days were trained in the use of arms. Jeroboam also set the battle in array against him with eight hundred thousand chosen men, being mighty men of valor. It was civil war in dead earnest, with no prophet interfering in behalf of Israel, since Jeroboam, on account of his idolatry, had forfeited all claims for protection.