[kevin]

One word for assaulting prepared positions: artillery

Arty is your best friend, use lot's of it.

Remember engineers. The computer will always throw out mines. I use them too. The idea is to slow down the enemy and use your own arty on them, so mass engineers and get through the minefield asap. Remember that regular Infantry can clear mines too.

Punch a hole in the enemy lines and move through it. Once in the rear try to hunt down enemy Mortars, take your objectives and find good defensive positions. The enemy will be forced to react (and leave those prepared positions) once you capture the victory hexes. At that point commit your reserve to the battle (I usually keep a larger reserve). Your reserve should be able to get some good movement shots as the enemy moves out of position. The reserve will drive them right into your operating group.