Iron Marines+: How to Beat Mission 3 Retaliation

To beat Mission 3: Retaliation on Sagan-1 in Iron Marines+, anchor your frontline with Commander Taggins, protect your landing zone with an automated turret, and use Snipers to dismantle alien hives from outside their defensive attack range.

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Early-Game Setup at the Landing Zone

Do not push across the map immediately. Swarm paths head straight toward your drop platform, making early defense your first priority.

1. Claim the drop site Etherium node: Establish your initial resource income immediately so your reserves can replenish.
2. Erect an automated turret: Build a basic ballistic or gatling turret on the forward-facing mount of your command center to thin incoming creepers without spending squad capacity.
3. Deploy Taggins on the perimeter: Position Commander Taggins just ahead of your turret's firing arc. This draws incoming melee beasts into the turret's attack line while keeping your base clear.
4. Train Riflemen: Spend your initial Command Points on a squad of Rifle Marines to support Taggins with steady mid-range fire.

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Squad Composition

Balancing sustained frontline defense with long-range structural siege damage prevents alien hives from overwhelming your squads with endless reinforcements.

A balanced force of Commander Taggins, one squad of Rifle Marines, and one or two squads of Snipers provides the necessary tools for this stage. Snipers outrange the retaliatory spitters defending each hive, allowing you to focus down nests safely while your frontline absorbs incoming waves.

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Unit Positioning and Managing Taggins

Keep your units moving in a tight formation: place Taggins at the point, position Rifle Marines directly behind him, and keep Snipers trailing at maximum range.

• Trigger Taggins' shield on elite spawns: When tough defenders emerge from a ruptured hive, activate Taggins' invulnerability shield immediately. This absorbs their primary attacks while your Snipers focus them down.
• Retreat Taggins to regenerate: If Taggins takes heavy damage, pull him behind your Rifle Marines rather than letting him fall. His passive health regeneration and cooldowns will recover while your infantry and base turrets hold the choke point.

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Step-by-Step Hive Clearing and Expansion

Pushing into multiple hive territories simultaneously will trigger overlapping swarm waves. Clear nests one at a time using this sequence:

1. Scout the perimeter: Walk Taggins forward just far enough to reveal the edge of an alien hive without pulling adjacent clusters.
2. Anchor the frontline: Halt your Rifle Marines behind Taggins to eliminate advancing runners and creepers.
3. Focus fire with Snipers: Manually target your Snipers on the hive structure. Their anti-materiel fire steadily burns through the nest's health pool.
4. Deploy support abilities: If a large counter-attack wave bursts out, drop reinforcements or support abilities directly between your backline and the swarm.
5. Secure the expansion node: Once the nest falls, build an Etherium extractor on the node and immediately construct a defensive turret to repel roaming patrols.

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Defending Against the Final Swarm

After destroying the primary hives across Sagan-1, prepare for a coordinated alien counter-attack from multiple directions.

• Upgrade occupied base defenses: Equip your expansion turrets with splash damage upgrades to eliminate packed clusters of swarm runners.
• Consolidate at a choke point: Pull your mobile units together at a central canyon choke point or bridge access rather than splitting squads across the map.
• Establish a crossfire: Plant your Snipers in open firing lanes behind Taggins. Activate his shield when the main swarm reaches the bottleneck, holding the alien force in place until your combined turret and sniper fire clears the stage.