Another way is to first quickly move to the middle and take out the tank crew.
Wait for the german supply trucks and take them out aswell.
Not too hard to keep the halftrack in one piece, so you afterwards got quite good supplied infantry, an MG-Halftrack and the tank.
Use your sniper to get the AT-Rifle (atleast 2 ones are around there from the fallen german soldiers) and move on the the right flank.
There is a train incoming which you can pretty easy take out. Not really necessary though. I did it to get cover for the later parts of the mission.
Move on with your sniper to take out some infantry on the right flank and once the Flakpanzer moves towards you, use the AT-Rifle to take out it's turret.
Repair the Flakpanzer and use it to destroy the forward AA guns and the halftrack in the middle. The heavy tank will now try to engage you.
Move back to your side of the river and place your verhicles behind the train, so they are spottable, but not killable.
The heavy tank will keep following them and once he gets close to the train use an infantrist to take out it's turret.
Once the crew leaves the tank take them out, use the repair kit on the tank and crew it.
With this heavy tank all other units (the one remaining AA gun, armored cars, MG-Nests, Infantry... etc) is just easy to finish off. Just use the secondary gun for the vehicles and infantry in buildings (since it's range is huge) and the MG, primary gun for close by enemies.
