What does 2 Chronicles 14:10 mean?

For he said to Judah, “Let us build these cities, and make walls around them, with towers, gates, and bars. The land is yet before us, because we have sought Yahweh our God. We have sought him, and he has given us rest on every side.” So they built and prospered.

Asa had an army of three hundred thousand out of Judah who bore bucklers and spears, and two hundred eighty thousand out of Benjamin who bore shields and drew bows. All these were mighty men of valor.

Zerah the Ethiopian came out against them with an army of a million troops and three hundred chariots, and he came to Mareshah.

Asa cried to Yahweh his God, and said, “Yahweh, there is no one besides you to help, between the mighty and him who has no strength. Help us, Yahweh our God; for we rely on you, and in your name are we come against this multitude. Yahweh, you are our God. Don’t let man prevail against you.”

So Yahweh struck the Ethiopians before Asa and before Judah; and the Ethiopians fled.

Asa and the people who were with him pursued them to Gerar: and so many of the Ethiopians fell that they could not recover themselves; for they were destroyed before Yahweh and before his army; and they carried away very much booty.