The fourth unit in the Barracks to be unlocked is the Goblin.
Strategy
While there are still any resource structures on the battlefield, goblins will prioritize them above all other objectives and ignore all other varieties of enemy troops and buildings.
Offensive: Goblins are excellent resource thieves. To get to the storage areas and mines/collectors, first make a path clear with wall breakers. Next, while the goblins are using all the resources, divert Mortars and Wizard Towers with Barbarians, Giants, or any other higher-health troops. Alternatively, you may just take off the splash-damage defenses first.
Defensive: Goblins are nonetheless helpful as Clan Castle troops even though they’re not thought of as the best defensive army. Compared to other forces, goblins assault the enemy relatively quickly because they have no resources to target. Goblins are the most powerful soldiers with minimal health, and their swift movement allows them to quickly engage opponent units.