Charles Spurgeon Commentary 2 Chronicles 12:3

"with twelve hundred chariots, and threescore thousand horsemen. And the people were without number that came with him out of Egypt: the Lubim, the Sukkiim, and the Ethiopians." — 2 Chronicles 12:3 (ASV)

With twelve hundred chariots, and sixty thousand horsemen: and the people were without number that came with him out of Egypt; the Lubims, the Sukkiims, and the Ethiopians.

This vast crowd consumed everything. The rule was to billet their troops on the enemy.

They would devour everything edible throughout the whole country.