Knock-out Roving Tiger Tank | Operation Market Garden MoH: Airborne Guide
Last update: 11 May 2016
I'd strongly recommend that you try your chances with this objective right away, especially since you'll be able to pick up more Gammon grenades from the crate. You'll also be quite safe inside this building. Your only concern should be to avoid receiving any hits from the tank.
Reaching your target:
Once you've collected the grenades, try hiding near one of the windows. I wouldn't recommend choosing the MG site, because you would have been exposed to enemy fire and the tank is moving that way, so you would probably end up being attacked by its crew. Choose one of the standard windows and wait for the tank (it's patrolling the entire area) to show up.
You won't have to be precise here, especially since the tank is near your position. You'll probably have to throw 3-4 at it. This should allow you to destroy the tank. Once this is done, you will automatically fulfill this objective. I would recommend going back to the plane and performing a new jump.