Note that this strategy is far less effective if splash damage defenses are in the area, as they will damage all Barbarians at once and destroy them relatively quickly.
This is balanced by the fact that the Barbarians are not very effective under heavy fire from splash damaging buildings. Large hordes are very effective as they will quickly destroy anything in their path.Players sometimes spread Barbarians to avoid them all being picked off in one group by a Mortar or a Wizard Tower as these Defensive Buildings deal splash damage.Barbarians are weak when breaking through walls and a group will tend to target multiple walls (if you do not follow the strategy above) so it is advisable to use Wall Breakers or high damaging troops such as P.E.K.K.As to break through.If you want all your barbarians to attack 1 wall instead of multiple ones, you can place one barbarian to target a wall, and then drop the rest of your barbarians, and then they should all attack the same wall.Archers and Giants are commonly used to support Barbarians.