The battle spread over the face of all the country, and the forest devoured more people that day than the sword.
Which way David raised an army here, and what reinforcements were sent him, we are not told; many, it is likely, from all the coasts of Israel, at least from the neighbouring tribes, came in to his assistance, so that, by degrees, he was able to make head against Absalom, as Ahithophel foresaw. Now here we have, I. His army numbered and marshalled, Sa2 18:1, Sa2 18:2.
Commenting on 2 Samuel 18:1-8
For the battle was there scattered over the face of all the country,.... Or the warriors were scattered, as the Targum; Absalom's soldiers, their ranks were broken, and they were thrown into the utmost confusion, and ran about here and there all over the field or plain in which the battle was fought, and into the neighbouring wood: and the wood devoured more people that...
the wood devoured more people than the sword--The thick forest of oaks and terebinths, by obstructing the flight, greatly aided the victors in the pursuit.