Iron Nest Mission 5 Guide: Iron Road

Iron Nest Mission 5 Iron Road is a two-phase operation in the Río Mula valley: intercept an enemy troop train before it reaches the Valle de Mula station, then silence two armoured emplacements so allied infantry can assault. The mission punishes one mistake above all others — sounding the assault signal before both emplacements are confirmed destroyed.

Quick Answer: Mission 5 Iron Road

• Verified on build/version: Source-checked 2026-09-12. The cited mission record does not publish a game build number, so no version is claimed here.
• Fixed rules: The train follows a published schedule (check the secondary typewriter); the track runs straight on a known bearing from the station; both armoured emplacements require AP shells; the war horn signals the assault and must not sound early.
• Random or run-specific data: All grids, bearings, distances, and waypoint positions come from the current operation. The timetable structure is fixed; the coordinates are not.
• Starting resources: 300 requisition and 12 powder charges are listed in the mission record; the roster lists 15 entities with 1 armored entity, while the operation orders describe two armoured emplacements — bring AP regardless.
• Gold conditions confirmed by the mission record: Measured Fire Star (ally kills ≤ 0), Unrelenting Volley Medal (kill streak ≥ 20), Ordnance Efficiency Cross (kills ÷ shots ≥ 2 with ≥ 10 kills), Unaided Fire Distinction (no aerial recon, kills > 18).

Phase 1: Intercept the Train

The briefing warns that a troop train is inbound along the supply corridor and gives an estimated station arrival time. The initial field intelligence adds the structure you need:

• The rail line runs straight, on a stated bearing from the station.
• Waypoints on final approach are listed with distances from the station and pass-through times.
• The secondary typewriter carries the live train movement schedule — the mission explicitly tells you to check it.

Plot the line from the station along the track bearing, use the schedule to know where the locomotive is at a given moment, and compute a lead shot the way you would for any moving target. A direct hit can cripple or destroy the train outright; hitting the tracks derails it, after which surviving reinforcements disembark and must be destroyed in detail. If the train reaches the station, the mission is not failed — but reinforcements disembark and the priority shifts to destroying all enemy presence around the station, a harder and more expensive fight.

Phase 2: Two Armoured Emplacements, Then the Horn

After the approach is cleared, allied infantry hold position and wait for your signal. Two armoured emplacements block their assault trajectory:

• The field intelligence update gives each emplacement as a bearing from one allied spotter plus a distance from the other — plot both intersections from the current run’s values.
• The orders are explicit: “The armoured emplacements require AP Shells to destroy.”
• Once both are confirmed destroyed, signal the assault with the war horn (hanging left of the trigger console or back right of the map table).

The caution is verbatim in the orders: “Signaling before you have completed your task will result in mass casualties.” The failure message is equally direct — assaults ordered against emplacements never confirmed destroyed end the mission. Confirm the kills first; the horn is the last step, not a way to check.

Mission 5 Medal Conditions

• Measured Fire Star: Gold with ally kills ≤ 0.
• Unrelenting Volley Medal: Gold with longest kill streak ≥ 20.
• Ordnance Efficiency Cross: Gold with (enemy kills ÷ shots fired) ≥ 2 and kills ≥ 10.
• Unaided Fire Distinction: Gold with no aerial recon used and kills > 18.

Common Failures

• Sounding the war horn early. The single documented mission-killer: infantry assault into standing guns.
• Ignoring the secondary typewriter. The live train schedule is there; the mission says so.
• Treating a derailment as a kill. A stopped train disembarks surviving reinforcements that still have to be destroyed.
• Letting the train reach the station. The fallback objective (clear the station area) costs more time and shells than an open-track intercept.
• Bringing only HE. The emplacements require AP; the record’s armored count and the orders’ two emplacements disagree in number but not in the shell requirement.

Sources / References

• Iron Nest DB — Iron Road mission record — Operation 5 resources, roster, train schedule structure, waypoint intelligence, emplacement fix pairs, AP requirement, war horn procedure, and medal thresholds.

Update Log

• 2026-09-12: Published the source-checked Mission 5 walkthrough. Timetable times are the record’s stated structure; all coordinates remain run-specific.

Previous: Mission 4 — Counter-Battery. Next: Mission 6 — Siege of Cartagena.