Wall placement is a key point in designing a well-defended village. Walls are the main fortification for defense and are capable of withstanding a great deal of damage from attacking enemies. However, the effectiveness of Walls is greatly lowered if they are not constructed to completely enclose the structures they are designed to protect. Any gaps in the continuation of the Wall structure will render it useless, as enemy troops will simply walk through the broken area.
An exception to this rule is the funneling strategy, where a player deliberately leaves a gap in order to group troops together and subsequently take them out using the splash damage of defensive units such as Mortars or Wizard Towers. Alternatively (or additionally) you intruders can be caught off-guard by filling the openings with traps such as Bombs or Spring Traps.
Walls block all ground units with the exception of Hog Riders and the Grand Warden. The use of Jump Spells allow ground units to bypass walls.
Walls can be bypassed entirely by air units such as Balloons, Dragons, Minions and Lava Hounds.
Wall Breakers immediately target Walls upon deployment, inflicting 40x normal damage to them, but also blow themselves up in the process. The holes created by Wall Breakers allow ground units to gain access to buildings within the Walls, making Wall Breakers the ideal troop for getting past Walls.
If there are 2 layers of Walls, the Wall Breaker’s blast radius will affect both layers.