Jamieson, Fausset and Brown on Judges 8:6

6. the princes of Succoth said, Are the hands of Zebah and Zalmunna now in thine hand--an insolent as well as a time-serving reply. It was insolent because it implied a bitter taunt that Gideon was counting with confidence on a victory which they believed he would not gain; and it was time-serving, because living in the near neighborhood of the Midianite sheiks, they dreaded the future vengeance of those roving chiefs. This contumelious manner of acting was heartless and disgraceful in people who were of Israelitish blood.