OpenFront · Combat · Guide
OpenFront How to Defend — Posts, Terrain and Nukes
OpenFront how to defend: the shield icon, terrain costs, defense-post range and effects, retreat penalties, and blocking incoming nuclear strikes.
By the New Game Wiki team · Updated 2026-10-04
On this page (8)
- How Defence Works in OpenFront
- Defense Posts and the Shield Icon
- Terrain, Retreats and Nuclear Defence
- What counts as a defender in OpenFront?
- What does the shield icon in OpenFront mean?
- How do defense posts work in OpenFront?
- How do I stop nuclear missiles in OpenFront?
- What happens if I retreat an attack in OpenFront?
OpenFront defence is not a wall you build and forget; it is a set of multipliers you manage. Terrain changes what an attack costs, defence posts change it again, and the shield icon tells everyone at a glance how soft your border is. Add missiles to the picture and defence becomes two layers: holding ground and stopping warheads. This page covers both, plus the penalties that punish a badly timed retreat.
How Defence Works in OpenFront
All of your troops defend, up to your maximum troop count, and any troops sent out on an attack stop defending immediately. That single rule explains most defensive failures: a player who pushes with 80% of their army has just cut their own defence by four fifths, and everyone can see it in the shield icon. Defence is therefore as much about restraint as about troops. Keeping a healthy reserve near the growth curve protects you without spending a separate resource.
- Everything defends by default. You never assign defenders; every troop inside your cap counts until it leaves.
- Attacking lowers your shield instantly. Committed troops stop defending, which is visible to everyone.
- Reserve size is a defence stat. A player near the growth sweet spot is far harder to punish than one at 5%.
- Defence is read, not guessed. The shield icon lets neighbours price your border before they commit.
Defense Posts and the Shield Icon
A defence post turns a normal border into an expensive one, and its price rises in 50,000 steps from 50,000 to a 250,000 cap. The two community sources describe the effect with different numbers, so treat the specifics as patch-sensitive while the direction is consistent.
| Source | Range | Attacker loss effect | Speed effect |
|---|---|---|---|
| Current community wiki | 30 tiles | 5x as many troops per tile | About 3x slower |
| Older Mirage wiki | 40-tile circle | Losses multiplied by 6 | Attack speed cut by 66% |
The shield icon is the companion readout. It displays defending troop density per tile, scaled by ten and rounded, so three troops per tile reads as 30 and one and a half reads as 15. Small players can exceed 30 because their population is concentrated. Because only defenders count, the shield is the fastest way to spot a neighbour who has just over-committed.
| Terrain | Defensive implication |
|---|---|
| Plains | Cheapest to attack and fastest to cross; garrison it |
| Highlands | Attackers lose 10% more troops; a mild speed bump |
| Mountains | Attackers lose 30% more and move 25% slower; your best natural wall |
Terrain, Retreats and Nuclear Defence
- Use the ground. A mountain border with one defence post is worth far more than an open plain with several.
- Mind the retreat cost. Pulling an attack costs 25% of the attacking troops, so a failed push double-penalises you.
- Keep SAM coverage current. SAMs and upgrades both extend the interception radius and the number of missiles caught in quick succession.
- Do not stack posts on one tile. The documented effect does not stack, so spread them along the border instead.
- Watch for traitors. A betrayed ally suffers a defence penalty for 30 seconds, which is exactly when they are worth attacking.
FAQ
What counts as a defender in OpenFront?
Every troop inside your maximum troop count defends, whether you assigned it or not, but troops committed to an attack stop counting. The community attacking guide puts it simply: only defending troops are shown in the shield icon, so launching an attack visibly lowers your defence the moment the troops leave. That is why a player who over-commits to a push becomes far easier to push back.
What does the shield icon in OpenFront mean?
The shield shows defending troop density per tile, scaled by ten and rounded. The community attacking guide gives two worked examples: three troops per tile shows as a shield of 30, and one and a half troops per tile shows as 15. Players who own very few tiles or cities can exceed 30 because their population is concentrated. Use it to read which neighbours are soft before you commit.
How do defense posts work in OpenFront?
A defense post strengthens the border around it, making attackers pay far more per tile and advance more slowly, and it is the only structure that cannot be upgraded. Sources disagree on the exact numbers: the current community wiki describes a 30-tile radius with five times the attacker losses and roughly a third of the normal advance speed, while the older Mirage wiki describes a 40-tile circle that multiplies attacker losses by six and cuts attack speed by 66%. Multiple posts never stack on one tile.
How do I stop nuclear missiles in OpenFront?
Build SAM launchers. A SAM intercepts incoming warheads that would land inside its radius, and the current community wiki gives it roughly 70 tiles of range at level one, growing toward 150 at high levels, with about nine seconds between interceptions and more ammunition per upgrade. The official client describes interception with a several-second cooldown. A silo without SAM coverage invites a counter-strike you cannot answer, so the two structures should be built together.
What happens if I retreat an attack in OpenFront?
It costs you troops. The official help panel states that retreating an attack by clicking the red X costs the lives of 25% of your attacking troops. A retreating boat attack sends the boat back to its starting point instead. Nukes cannot be retreated once launched, so a nuclear strike is always a committed decision, which is another reason to hold silos until the target is worth it.
More in Combat
More combat pages in OpenFront.
- OpenFront How to Capture Trade Ships — Piracy and TradeGuideUpdated 2026-10-04
- OpenFront Build Warship — Cost, HP and Naval ControlGuideUpdated 2026-10-04
References
Facts on this page are compiled from the references above. Items marked "to confirm" are single-source and not yet verified.