Unto The Breach

Unto The Breach is the fourth level in Iron Marines, and the fourth one on the planet Sagan-1.

Briefing: "The Fell breached our outer defenses and disabled our Plasma Cannon. Scouts report that a massive enemy force is rushing to that location right now.

We must restore the cannon's batteries to repel the enemy attack, or everything we've worked for will be lost."

Mission Objective: Restore power to our Plasma Cannon.

Level
This level is different from previous levels, because instead of playing offensively, the player must play defensively. There are four etherium refineries in this level. The three farthest from the Plasma Cannon can be destroyed, but if the refinery adjacent to the Plasma Cannon is destroyed the level is failed. The player must capture the three refineries, one in the top, one in the middle, one in the bottom, and defend them until the time runs out.

Waves of enemies will keep coming from the far right side of the map, and from spawners scattered in random places. The player should aim to capture one etherium refinery at a time, and to station units such as snipers there to defend.

After all refineries are captured, a timer will appear and start ticking down. The player must defend all the refineries until the batteries for the Plasma Cannon are recharged. After the timer has finished, the level shows a cutscene where a massive fell force is destroyed by several blasts from the cannon, and the player has won.

Strategy
Shellstorms are introduced in this level. They are the second mecha units. The player should focus on getting the shield upgrade for refineries as fast as possible. It is also advised to station troops behind towers so they can assist in chipping away at units. The refinery in the bottom row of the map should be captured last, as it is the most difficult due to the abundance of spawners surrounding it. The player can split up units and micro their hero to assist in areas that are being overwhelmed. In this way, all refineries will be kept intact.