|The archers take position in the tower|
|The assault begins|
|A beastmaster has his minions break through a wall|
|Instant Siege Tower|
In terms of construction, blocks laid on their side require a climb check of some kind to traverse over and usually have them be 20 feet high. Blocks lain the other way I've had give cover to anyone behind them. Players inevitably run on top of the blocks, which can give them a nice height advantage, but has also lead to some nasty tumble checks when they attempted to jump down.
|Dice make excellent minion markers|