'Threshing sledges' in the Bible

And Gideon will say, For this in Jehovah's giving Zebah and Zalmunna into my band, and I threshed your flesh with thorns of the desert and threshing-sledges.

And he will take the old men of the city, and thorns of the desert, and threshing sledges, and with them he caused the men of Succoth to know.