IF you have a bunch of bunkers in lines, right when the guy is about to look out one side of his bunker charge him, run by the other side and get in a bunker behind him. Then if he stays there he has no cover, and if he rotates to the other side the rest of your team can get him.
Especially good if you can shoot more than one of them without them knowing you are behind them.
I did this to a guy and he just stared at me dumfoundedly. I dove over a log and he started shooting at me like crazy, so I popped up and tagged him twice. I then got out another guy on his team.