John Gill Commentary Judges 8:7

"And Gideon said, Therefore when Jehovah hath delivered Zebah and Zalmunna into my hand, then I will tear your flesh with the thorns of the wilderness and with briers." — Judges 8:7 (ASV)

And Gideon said
In answer to the princes of Succoth:

therefore when the Lord has delivered Zebah and Zalmunna into my
hand ;
of which he made no doubt, having the promise of God that he would deliver the host of Midian into his hand, on which his faith rested; and having it in great part performed already, most firmly believed the full performance of it, see (Judges 7:7Judges 7:9)

then I will tear your flesh with the thorns of the wilderness, and with
briers ;
which grew in a wilderness near this city, and from which as Kimchi thinks, it had its name; the word "Succoth" being used for thorns in (Job 41:7) and the sense is, either that he would scourge them with thorns and briers; or, as the Targum thrust their flesh upon them; which Kimchi interprets of casting their naked bodies upon thorns and briers, and then treading on them with the feet; or draw a cart over them as they thus lay, in like manner as it was usual to do when corn was threshed out; see (Isaiah 28:27) .