The Sissi just wipe the floor with any Soviets unlucky enough to be stationed outside of the town. The Soviet tactic is to run to the town with any forces required to be set up outside of the town. If the Finns catch you they will assault you and you will die. It is just that simple. You will not hold the roads except for maybe the north south road through the town.

As the Finnish commander you have but one goal. Destroy any Soviets you can catch in the open (remember the "open" isn't very open at all given the forested nature of the area). You move much faster than them, they can't see you and when you catch them you will almost certainly have three column increases on the assault table (morale, leader and Finnish infantry). Assault with abandon. No big surprise, the Finns win.

In a way this one is almost too easy for the Finns. It will require a crackerjack setup to have enough forces outside of the town to cause the Finns to delay yet not too many as to provide too many VPs for the Finns. Remember as the Soviet player your guys will want to run away from the Sissi (doesn't that sound dumb...).