During those peaceful years, he was able to build up the fortified cities throughout Judah. No one tried to make war against him at this time, for the LORD was giving him rest from his enemies.
Asa told the people of Judah, "Let us build towns and fortify them with walls, towers, gates, and bars. The land is ours because we sought the LORD our God, and he has given us rest from our enemies." So they went ahead with these projects and brought them to completion.
King Asa had an army of 300,000 warriors from the tribe of Judah, armed with large shields and spears. He also had an army of 280,000 warriors from the tribe of Benjamin, armed with small shields and bows. Both armies were composed of courageous fighting men.
Once an Ethiopian named Zerah attacked Judah with an army of a million men and three hundred chariots. They advanced to the city of Mareshah,
References for 2 Chronicles 14:9
so Asa deployed his armies for battle in the valley north of Mareshah.
References for 2 Chronicles 14:10
Then Asa cried out to the LORD his God, "O LORD, no one but you can help the powerless against the mighty! Help us, O LORD our God, for we trust in you alone. It is in your name that we have come against this vast horde. O LORD, you are our God; do not let mere men prevail against you!"
So the LORD defeated the Ethiopians in the presence of Asa and the army of Judah, and the enemy fled.
References for 2 Chronicles 14:12
Asa and his army pursued them as far as Gerar, and so many Ethiopians fell that they were unable to rally. They were destroyed by the LORD and his army, and the army of Judah carried off vast quantities of plunder.
While they were at Gerar, they attacked all the towns in that area, and terror from the LORD came upon the people there. As a result, vast quantities of plunder were taken from these towns, too.
They also attacked the camps of herdsmen and captured many sheep and camels before finally returning to Jerusalem.