Jeff Cooper once said:
“The only acceptable response to the threat of lethal violence is an immediate and SAVAGE counter-attack.”
So when three masked morons want to attack your vehicle with machetes remember that you have the upper hand: That 3 ton vehicle underneath you. Punch the gas and flatten them.
Also, irregardless of what TYPE of fight it is, whether you are on foot or in a vehicle, FORWARD is always better than BACKWARDS.
The reason for this is simple. When you are back peddling in a hurry, you cannot see where you are going and will more than likely trip (on your own feet or something else) and fall down. Or, if you are driving, crash into something and disable the vehicle. Both are Bad and put you at a disadvantage.
This is why the Spartans had the Motto “Always forward, never back.” Both as a tactic on the battlefield and as a mantra for life in general.