20:21a Then the king of Israel marched out and attacked the horses and chariots,

The king of Israel went out ⌊to the battle⌋, striking/attacking the horses and chariots.
-or-
King Ahab ⌊himself⌋ went out to fight the enemy, with their horses and war carts. He defeated

20:21b inflicting a great slaughter on the Arameans.

He struck down a great many/number of the Arameans.
-or-
the Arameans/Syrians, killing/slaughtering many of them.

Section 20:21-43

Ben-Hadad attacked a second time

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