Slewahundredthousandfootmeninoneday - This number is enormous; but the MSS. and versions give no various reading.
Matthew Henry
Concise Bible Commentary
Those about Benhadad advised him to change his ground. They take it for granted that it was not Israel, but Israel's gods, that beat them; but they speak very ignorantly of Jehovah. They supposed that Israel had many gods, to whom they ascribed limited power within a certain district; thus vain were the Gentiles in their imaginations concerning God. The greatest wisdom in worldly concerns is often united with the most contemptible folly in the things of God.
SDA Bible Commentary (limited)
Volume 1-7
29. Hundred thousand footmen. The loss for Syria this time seems to have been largely among the infantry, whereas the previous season it was “the horses and chariots” (v.21) that were especially mentioned as having been smitten.