I won in 48 minutes.
I took the following units
-Jagdtiger
-Jagdpanzer
-Panther
-StugIV
and the one Panzerchreck squad that you can't divest yourself of.
I setup the four tanks on near side of the river, right side, behind a hillock. This left them hidden from all approaching units. Within two minutes the first T34s reached the bridge and began to cross. I opened up with all four and disabled the leading T34 midway across the bridge leaving it obstructed.
The Soviet tanks were forced to reverse and move around the right flank where the river gives way to open ground. The only avenue of approach though is the open rail bed that has been cut into the hill side. With its narrow dimensions and high sides the enemy tanks have little room to maneuver (and none to flank). Further they are forced to come up almost singly which allowed me focus my four tanks on a single target.
My losses were minor... the infantry were overrun (I paid them no mind, dropped them in a courtyard and left it at that) perhaps 15 or 20 minutes in and my Stug was destroyed by an IS-2. Reinforcements weren't triggered.
Difficulty was set to the max.