Campy soviets on this map is one of my pet peeves because Ost is a little lacking in the tools to deal with this type situation.
Firstly, the soviet player got an early T2 and mortor. You can see this through the fog of war so you need to think about countering this, which grens and mg42 just don't do. A scout car is of little use vs sov T2 unless your on a more open map. It is too hard to navigate the choke points on this map, your at risk of mines, early at guns will reduce its effectiveness and his mortors were in fairly defensive positions.
Ideally you want a fast pgren for flanking and to take out his mortor because once he gets dug in your job only gets harder. A counter motor is also necessary to apply pressure to mgs, at guns and at the very least to make him reposition his own mortor. Also smoke can help pgrens and flamers get in close.
You had a mortor half track, use it. It can apply a lot of pressure on campy soviets especially if you flank with pgrens at the same time.
You were caught out with your p4s, gotta watch those cps. Once T34 85s are due, start playing defensive, get two pack40s and keep them behind your tanks. Also start putting down tellers in the area you want to keep your tanks. I have 3 teller mine bulletins which lowers the price to 41 muni, really effective against sov callins.
Eventually i think your loss boils down to not providing any indirect fire on his support weapons and not having any units for CQ combat. It is entirely possible you could have defeated him before the callins.
Also, you were floating at one stage, a muni or fuel cache would have been beneficial...
Thanks skemshead!
After reviewing my game, I agree with you that I should have gotten a mortar as well. I think why I didn't get one was that I thought he had the 120mm (out range me?) Also, I am afraid to get PG cause they are so fragile! However, this map has lots of cover you are right, I should have gotten some PG. Good advice!