Barbarians are the highest hit point swarm troop in the game. It also has a strong damage that can easily destroy tanks and towers once all 4 of them starts attacking a single target. However, because of being a swarm troop, strong splash damaging troop can counter them. Wizards, Bomber, Bomb Tower and even Fireball can effectively counter the Barbarians. But without a splash damaging card, you’ll find it hard to counter them.