Walls and defensive land units: Stronger together!
This guide is mostly revolt-focused. You can still build high walls and stack them with defensive land units (DLUs) in Conquest, but in Conquest, if a colony ship does manage to land, high walls can work against you and in favor of your attacker by making backsnipes and siegebreaks harder. However, in Revolt, there are no sieges, backsnipes, nor siegebreaks, since a city is lost instantly when a Colony Ship lands during Red Revolt, so high walls are much more common in Revolt. In any case, if you do want to build high walls in either game mode, you will want to stack many defensive land units (DLUs) behind those walls. The reason being that DLUs without high walls get slaughtered, but high walls without DLUs get knocked down easily. (Or, if you are playing Conquest, and you have a high wall without DLUs, your attacker will just leave the wall up and use it to defend their siege, in all likelihood.) To illustrate the point, check out the following simulation results. For each, I as...