If, at a matched play event, the placement of the terrain is being done by the players, they should use the following method:
Determine how many terrain features to set up, based on the size of your battlefield.
From the terrain available the players choose a number of features, up to the maximum number of features needed.
Once both players have chosen, the winner of a roll-off sets up the battlefield, placing the chosen terrain features as they see fit.
With all of the terrain placed, the loser of the roll-off chooses D3+1 terrain features and rolls 2D6 and a Scatter dice for each:
If an arrow is rolled on the Scatter dice, the terrain feature moves a number of inches equal to the roll of the 2D6 in the direction the arrow points, stopping should it touch another terrain feature or the edge of the battlefield.
If a 'Hit!' is rolled on the Scatter dice, the terrain feature does not move.
Terrain features can be placed anywhere on the battlefield, but not within 12" of its centre and not within 3" of another terrain feature. The only exceptions to this are terrain features specified by the scenario and special features.
Should the players agree, or should the scenario require it, battlefield decorations can be placed in the same manner.