Karelia. Sheep Herding.

ARGO: To be honest, I have found that there is really only one descent way of playing this map:
As you all know there are only 3 ways you can go and no one in thier right mind runs down the middle so that means there are 2 now. We all know that the enemy 9 out of 10 times stickes to whatever side that the mountain is on "out of fear of arty" and usually sends a small contingeant the other way as kind of a faint maneuver so heres what you can do:
Send out your scouts one per side to get a bead on the size of the forces comming.
Reduce enemy numbers by nailing those scouts of his, If your enemy cannot see, he cannot fight.
When you have figured out which way the heaviest force is, re-direct whatever TDs Arty to that area mostly allowing your enemy to believe that this is your main force. Your prime objective here is to not advance or take them head on but simply buy the main force time to get across the map to flank and or cap.
Take your main force around the other side and send whatever scout you have left to raid the enemy arty or at least light it up "important".
If all goes well then you have the enemy all tied up by your TDs and you artys pounding them, You scouts/mediums have taken out their arty and you main force is either capping or comming around the enemies back side wedging them between you TDs/Arty fire and now you.
This may not always work because from here you are relying on your team to pay attention and your teams skills to prevail but It will at least give you a fighting chance if properly carried through as long as you stick to the plan.