Sunni hostage Kassig beheaded by ISIS militants in new video released online . Gerges : Peter Kassig 's beheading reveals a terror group that is desperate and on the run . Gerges : American -led airstrikes are working and ISIS ' leaders are being driven underground . Gerges : On November 7 , American warplanes bombed a convoy of vehicles near Mosul , in northern Iraq . ISIS tribes that were loyal to Sunni are now peeling off amid the group 's ongoing brutality .
Sunni hostage Kassig beheaded by ISIS militants in new video released online . Gerges : Peter Kassig 's beheading reveals a terror group that is desperate and on the run . Gerges : American -led airstrikes are working and ISIS ' leaders are being driven underground . Gerges : ISIS tribes that were loyal to Sunni are now peeling off amid the group 's ongoing brutality .