>>96069394
For F&R you need some, but surprisingly little in the right spots so that the entire armies can't just move directly forwards in perfect parallel. If there is something like a hill on one side, it gives players a reason to send parts of their army there to claim it.
>>96067934
Is a good example but I would move the copse of trees about 12" inboard to make that far side of the board a flanking threat and tighten the middle some.