Amazingly hard

[pjbandit2003]

I guess that is why the Soviets kept giving ground instead of fighting until Stalingrad and the hordes of T34s could be fielded.
The only way I can deal with them is to use scouts to find them and then set up ambushes the AI tends to walk right into them if done right. But those 50's and even the 37's go right through the armor of the T-26s and T28s (not to mention the short 75s)

[Imp]

Yep the AI might but a human not so much he to has scouts & even guys on foot can nearly keep up. Makes you realise why the modern mechanised force was born superior numbers means little if the enemy can pick them off piecemeal.