Question: Soviet infantry bt vs. infantry/tanks

[Imp]

Soviets early war anti tank capability is not good.

Lack of experience is a big problem generally.
Infantry has no AT capability just grenades, expect to see a lot of tank panic if assault.
Have to think about your artillery as its slow to react, this also makes placing smoke to cover moving AT guns hard.
Your AT weapons to hit is not the best & you don't get many shots to improve your chances.

You do get probably the most potent movable ATG though.

Your engineers can at least take on armor if they don't panic & also are your fast smoke screen for doing things undetected as they normally have a decent amount of it.

Its hard I seem to spend as much time falling back as going forward trying to avoid arty & draw them into mine.

Using just or mainly ATGs is hard slows the game down especially if assaulting but can be very effective if micro manage a bit.
Turn down ranges let them stroll in pound the eyes (infantry) then open up with hopefully 4-6 ATGs firing from different angles for a bit of carnage.

Lack of mobility does mean a much higher chance of things going very wrong because changing the plan takes time.

Mid war your experience improves & given the right terrain the infantry are capable of taking on tanks, not the best AT weaponry but it will do the job.

[Wiking]

You've certainly set yourself a tough row to hoe! Like Imp said, your lack of experience will make things harder than it would be even as the Germans or Japanese. The engineers in particular are somewhat lightly equipped at the start of the war, and their poor morale doesn't help either. I do think that playing a purely infantry force in WINSP is difficult prior to the advent of launchers, but it is doable if you really want the challenge. Most of what Imp said is sound advice but I'd add the following:

Your BT's can handle anything any other country out there except France maybe can throw at it. They have essentially no armor for all practical purposes, but their incredible cross country ability and speed coupled with a fairly good 45mm gun means you can position them almost like self-propelled anti-tank guns if you're clever about it. The main thing to remember is that with their low experience, they'll do better if they get op-fire instead of trying to have them shoot on the move. Try to position them and then let the enemy come to you.