Here's a pic from our 4WD clubs Winch Challenge in Queenstown last Saturday. Basically the course entails driving as far as you can thru the muck, get stuck, then the winchman (the passenger) has to leap out and secure the winch rope round a handy tree or similar in order to winch the truck out. Secured in front of the truck you can see the ground anchor, this is used much like a boat anchor when there's no handy tree to take advantage of. Then you move on to the next obstacle and do it all again. It's much easier taking photos.