I believe its in the manual but haven't seen it happen.
In an effort to to solidify my court martial after blundering into a firefight in a heavy forest I repeadtedly threw my brittle (regular mostly broken status) squads back into the fight as I slowly pushed the resistence back.
The squads would go to panic or shaken status and retreat back where they would be rallied back. Where I would throw them right back in. While I was advancing slowly and was "winning" I would not expect any to surrender, however, was expecting to see some of the troops to no more and rout (the old explanation point from CMSF).