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Your battlefield will become fully alive, when you are able to fill it with natural looking objects.

For the most agile solution pick small object that can be used in a generic manner.
Do hills, houses, small pieces of road, fields, fences, trees etc. that can be moved around as you please - making new battlefield everytime.

For the most realistic looking solution, let's make a full battlefield from example three larger tiles of terrain where everything is incorporated into the board.