I've been thinking about using a strategy of 2 stacks of 10 units. (One stack with General or none.)

Using the two stacks of half size, one stacks maneuvers behind the enemy stack allowing the other to attack the stack from behind.

If you do this right, you can get battles where you have your guys boxing in the enemy.

Could be especially useful against cav armies - they can't run away.

I know the AI sometimes comes at me like this and it's tough to defend against two front at once.

This would also bring some "strategic" maneuver into the game.

You could even have 3 stacks of 10 units...might help when the AI gets those secondary attacks after the patch.