Instructions
Move as close as you can to the treads of a tank, until you are within grenade range.
Throw a sticky grenade at the treads of the tank. A sticky grenade is one that sticks to the target instead of bouncing off like a normal grenade. If your aim is inaccurate you may have to attempt this shot a few times before a grenade adheres to the treads.
Run away from the sticky grenade. Because the grenade is stuck to the treads of the tank, the explosion will knock the treads off, rendering the tank immobile.