Matthew Poole and continuators on 1 Kings 20:23

23 And the servants of the king of Syria said unto him , Their gods are gods of the hills, therefore they were stronger than we: but let us fight against them in the plain , and surely we shall be stronger than they.

They suppose that their gods were no better than the Syrian gods (which the Idolatry of the Israelites had given them too great cause to imagine;) and that there were many gods who had each his particular charge and jurisdiction; which was the Opinion of all Heathen Nations, That some were gods of the Woods, others of the Rivers, and others of the Mountains; and they fancied these to be either, because the Land of Canaan was a Mountanous Land, Deut. 12. 2. And the great Temple of their God at Ierusalem stood upon an Hill, and so did Samaria, where they had received their last blow: or because the Israelites did generally chuse High Places for the Worship of their gods. It is observable, that they do not impute their ill Success to their Negligence, and Drunkenness, and bad Conduct, or Cowardize, of which they were really guilty; nor to the Valour of the Israelites; but to a Divine Power, which indeed was visible in it.

Wherein there was not onely Superstition, but Policy; because the Syrians most excelled the Israelites in Horses, which are most serviceable in plain ground.