So far I have found these defence lines almost impossible to deal with, I've been winning my few battles by forming them myself and having the AI break on them, then counter attacking the very badly damaged attackers, from the weakened flanks.
Funny thing is, this is also how TW games are won !.....a lot of the time the attacker will fail, becasue both sides have
roughly equal forces, then the defender becomes the attacker and has a badly weakened enemy to beat.
I did manage to get a game in today and by about midday it looked like a certain defeat for me, it looked like I was heading for the worst result so far, but then it all changed suddenly and the Russians broke, with two fresh Corps I swept away what remained of the enemy army, this was partly due to good luck as the biggest Corps I had in the rear had refused all orders to move earlier on - it was like a forced reserve !.
I believe it to be impossible if you don't have a huge numerical advantage
I think MP games are going to be very hard for the "attacker" to win, assuming an equal level of player skill on both sides, the attacker is going to be at some dis-advantge in making the "first" move against a well laid out defensive line..........on the bigger maps it will be a different story, but on the small maps, with a large OOB it's going to be very hard.