Helicopter-Air-Bomb
First, grab an Allies Transport Helicopter, you can find one on the back roads right on the river near the allies base in the first providence you are at. Fly the chopper to the place where you found the two of clubs.
You will see that that the allies have converted it into a helicopter landing station, in between the two landing pads are two yellow fuel tanks, use the winch in your helicopter to pick up one of the tanks, carry it to the location of your choice, but don't go too fast or the tank will hit you and explode, killing you.
When you get to where you want to be drop the tank on whatever is bugging you (men and light cars only) the tank will explode and they will die or get baddly injured. (I didnt try this yet but also you can also use the small yellow barrels or the chinese fuel trucks.)
More tricks, tips and cheats for this game are right here - Mercenaries: Playground of Destruction cheats
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