If you're out numbered, go for the most lethal or vital points possible...eyes, throat, elboes and knees.
If you can dive shoulder first full force into the knee of one of the attackers, he will never walk again without limping.
If you get behind one and can't get a choke hold, dig your fingernails into his upper gums...if asked he will take you to his bank and withdraw all his money for you.
Always avoid fights whenever possible, but if it's GOING to happen whether you like it or not, fight as if your life depended on it. And above all...remember, there is no such thing as a "fair fight". Do whatever it takes to ensure your survival.