2 Chronicles 13:15
Then the men of Judah gave a shout: and as the men of Judah shouted, it came to pass, that God smote Jeroboam and all Israel before Abijah and Judah. Then the men of Judah gave a shout: and as the men of Judah shouted, it came to pass, that God smote Jeroboam and all Israel before Abijah and Judah.
The verse belongs to the period after Solomon's death when the kingdom was divided, with Abijah's reign set amid the history of Judah. It belongs to the account of the war between Judah under Abijah and Israel under Jeroboam, in which Judah conquered and won. In this setting Jeroboam led Israel away from God through the golden calves.
The battle was decisive, with Judah greatly outnumbered and attacked from both front and rear. Abijah called on the Lord, and the priests sounded their trumpets before the people shouted. As the men of Judah shouted, God smote Jeroboam and all Israel before Abijah and Judah and gave Judah the victory. Judah's shout is a scriptural example of shouting in praise to God, expressing faith and holy joy.
Applied to the American Civil War, Judah and Israel represent the North and the South and their battle represents the conflict between them. The Southern rebellion would have ended sooner if the government had followed Abijah's example and not supported slavery.