Hobnail

I have the same problem with this mission, I can hit the two B-11 on the right flank pretty easily with HE. The trick is after that flank advance just so you're hull down on the honking big AT gun on the second hill on the left. Take that out and flank advance again on the final B-11. If you hang around in that valley too long, you will get an RPG up the tail from the infantry that crests the hill on the left flank a few minutes after your troops go past.

That and some of the force of the explosion from the penetrating round/exploding ammo is vented out of the tank instead of pureeing the crew. A primitive version of blow-out panels fitted to Western tank designs (I think the T80 has this but not the T72...)

I've brewed up the Leopard in both the 2nd and 3rd demos. In one instance it continued to roll/motor down the slope, burning away as it went.

Now at 3D Gamers which includes Aussie mirrors for yours truly.