We're learning what ISIS does to fighters who don't fight hard enough.

FOX's Jessica Golloher has details:

After ISIS fighters lost the strategic city of Ramadi to Iraqi troops and the U.S.-led coalition, they fled the area to the insurgent's stronghold of Mosul.

They were grouped together by other ISIS troops, made to stay in a circle in the town square, and then set on fire and burned alive.

ISIS is doing this to send a clear message to others about what will happen if they do not fight to the death.

The Islamic insurgents took over Ramadi last May and Iraqi forces  tried to retake the strategic city several times.

They were finally successful at the end of last year.

In the Mideast bureau, Jessica Rosenthal, FOX News.