Deployment itself, next to army selection is the single most determinitive element of any WHFB game. Yet, all to often deployment is a rapid fire, careless exercise. Let me give you an example of particularly effective deployment. . . . Wood Elves are natural masters of deployment. With so many scouts and units that can hide and manuever through trees, the terrain is an ally of these tree hugging warriors.
Problem is. .
I tend to place whatever clumps of trees I have all over the board, anywhere with no real focus in mind BUT to keep one or two clumps in my deployment zone. We play a little bit different than most generals. If you can not see a unit, we mark it on a piece of paper but DO NOT put it on the board. THe God's eye view of field makes it too easy for the opponent to know what to expect and to plan for it. I have even had one opponent move his main strike force into the largest clump of trees only to find that the 2 units of dryads were on either side of him.