Ambushes

2 Chronicles 20:22-24 - As they began to sing and praise, the LORD set ambushes against the men of Ammon and Moab and Mount Seir who were invading Judah, and they were defeated. The men of Ammon and Moab rose up against the men from Mount Seir to destroy and annihilate them. After they finished slaughtering the men from Seir, they helped to destroy one another.

When the men of Judah came to the place that overlooks the desert and looked toward the vast army, they saw only dead bodies lying on the ground; no one had escaped.

I wonder what kind of ambushes the LORD set for the invaders. Were there natural traps in the area that they fell into? Or is this a reference to the in-fighting that eventually destroyed all 3 invading armies? Did they start setting ambushes on each other?

I wonder ihow it happened that they all died, that "no one escaped." Reminds me of the gingham dog and the calico cat:

Next morning, where the two had sat
They found no trace of dog or cat;
And some folks think unto this day
That burglars stole that pair away!
But the truth about the cat and pup
Is this: They ate each other up!