Retaliation

Retaliation is the third level in Iron Marines, and the third level on the planet Sagan-1.

Briefing: Our sensors have located a Fell cluster close to our position. We suspect that a main spawner may be there multiplying our enemies' numbers.

A defensible outpost has been established to launch operations against the target. It's payback time.

Mission Objective: Locate and destroy the enemy's main refinery in the area.

Level
The level starts off with the player being instructed to build a minigun tower. The minigun then defends against the small enemy force approaching it. After all the enemies are cleared, the player gains access to their hero, and can proceed up the level. Directly above the refinery is a fell base and a command point, which the player can capture with their hero and dropguns.

After capturing it, the player can continue to proceed. Right above the fell base that the player encountered, there is another fell base, which can also be captured. The player must continue to defend against waves of fell that come from the main fell base's spawners.

The final fell base lies at the very top of the level. Worm cannons and spawners are present, which will periodically spawn units. Once the player captured this base, the level is completed. If the player's main refinery is destroyed (the one at the very bottom), the level is lost.

Strategy
In this level, the first mecha unit is introduced: The flamewalker. The flamewalker possesses a fire AoE attack that excels are clearing weak hordes of fell. It is highly recommended. However, the player must use it carefully as it is very expensive. It can be destroyed by ranged attacks over a long period of time.

Other units, such as snipers and rangers are also present. Snipers are not recommended on this level due to the sheer amount of enemies that can overwhelm them. Rangers are a good choice, but must be supported and mobilized well.

The main threat on this level are the Spitterbugs. Their range nearly rivals that of snipers, and they are surprisingly durable. They will continue to spawn from the fell spawners. The player should try to drop his hero and a dropgun on spawners to destroy them, as spawners cannot be rebuilt. This permanently alleviates pressure for the rest of the level. However, it is likely that the hero will die in the process, but this is not usually a problem because the refineries are adept at defending themselves.