OGame Combat Guide: How Battles, Shields & Rapid Fire Really Work

OGame combat looks chaotic from the outside, fleets collide, ships explode, a report full of numbers gets dumped in your inbox, but the system underneath is fully deterministic and well documented. Every battle runs on the same four stats (Weapon Power, Shield Power, Hull Plating, and Rapid Fire) across a maximum of six rounds. Once you understand those mechanics, fleet composition and defense planning stop being guesswork and start being math you can actually run yourself, including with our own Battle Simulator further down this guide.

In this guide

• How OGame Combat Actually Works: Rounds, Weapons, Shields & Hull
• The 70% Rule: When Ships Start Exploding
• Rapid Fire: Why Some Ships Get Extra Shots
• A Real Combat Round, Worked Out
• Fleet Composition Tactics That Actually Matter
• Debris Fields, Defense Rebuilding & the Espionage-Probe Trick
• Try It Yourself: The OGame Battle Simulator

How OGame Combat Actually Works: Rounds, Weapons, Shields & Hull

Every unit on the battlefield, ships and defenses alike, carries three combat stats: Weapon Power (W), Shield Power (S), and Hull Plating (H). Hull Plating is simply the ship's Structural Integrity (the cost-based stat you see on the ship overview) divided by 10 — a Cruiser with 27,000 Structural Integrity fights with 2,700 Hull.

A battle lasts at most 6 rounds. If the attacker hasn't wiped out every defending unit by the end of round 6, the fight ends in a draw and the attacking fleet flies home empty-handed. Within each round, every ship and defense unit fires once at a randomly chosen enemy target, and for every single shot the game checks three things in order:

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1. Is the shot too weak to matter? If the attacker's Weapon Power is less than 1% of the target's current Shield Power, the shot simply bounces off. The target loses nothing.
2. Does the shield absorb it? If Weapon Power is still lower than the Shield Power, the shield eats the whole hit (Shield − Weapon) and the hull is untouched.
3. Does it punch through? If Weapon Power is greater than the remaining Shield, the shield drops to 0 and whatever damage is left over (Weapon − Shield) comes straight off the Hull.

Shields fully regenerate to their starting value at the end of every round (as long as the unit survived), but Hull damage carries over from round to round — a ship that entered round 2 with half its hull gone stays at half hull, it doesn't heal.

The 70% Rule: When Ships Start Exploding

This is the single most misunderstood part of OGame combat. A ship doesn't just die when its Hull hits zero from a big hit — it can explode earlier, the moment its current Hull drops below 70% of its original Hull value.

Once a unit is under that 70% threshold, every single shot it takes (even a tiny one) rolls a chance to instantly destroy it, equal to 1 − (current Hull ÷ original Hull). A ship sitting at 25% of its original hull has a 75% explosion chance on the very next hit it takes, regardless of how small that hit is.

This is why a swarm of small, low-damage shots is often more lethal to a wounded ship than people expect: the explosion roll happens on every shot, not once per round, so lots of little hits chip away at a weakened unit's survival odds far faster than the raw damage numbers suggest.

Rapid Fire: Why Some Ships Get Extra Shots

Certain ship-vs-target matchups have a Rapid Fire value (for example, a Cruiser has strong Rapid Fire against Espionage Probes and Solar Satellites). After a unit fires and resolves its shot, if it has Rapid Fire (value r) against that specific target type, it gets a (r − 1) ÷ r chance to immediately fire again at a new random target and repeat the whole process.

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In practice this means a single Cruiser can end up firing three, four, or more shots in one round if it keeps rolling Rapid Fire against soft targets like probes or light fighters — which is exactly why a handful of Cruisers or Battlecruisers can shred a large stack of cheap scout ships almost instantly.

A Real Combat Round, Worked Out

Here's a simplified, real walkthrough (based on the OGame Wiki's own documented example) of 1 Cruiser attacking 2 Rocket/Missile Launchers plus 1 Heavy Laser, all at zero weapons/shield/armor technology:

In round 1, the Cruiser's 400 Weapon Power overwhelms a Missile Launcher's 20 Shield instantly (200 − (400 − 20) leaves it destroyed), and because Cruisers have Rapid Fire against Missile Launchers, the same Cruiser keeps rolling extra shots, wiping out both Missile Launchers in the same round before finally hitting the Heavy Laser for 250 damage. The Heavy Laser survives round 1 at 500/800 hull (62.5%), which is already under the 70% threshold. In round 2, one more hit drops it to 200/800 (25% of its original hull), rolling a 75% explosion chance, and it explodes. Even a lone Cruiser can, with a favorable set of Rapid Fire rolls, wipe out this whole defensive line in just two rounds while taking chip damage the whole way, this is the same underlying engine our Battle Simulator below runs, shot for shot.

Fleet Composition Tactics That Actually Matter

• Match your ships to what you're actually fighting. A fleet full of Battleships is overkill (and wasteful) against a handful of undefended Espionage Probes; scout first so you don't overspend on firepower you don't need.
• Rapid Fire cuts both ways. If you know your target has ships with strong Rapid Fire against your unit type (Cruisers vs. small ships, for example), sending a large stack of that vulnerable unit type lets one lucky enemy ship snowball through your entire fleet in a single round.
• Cheap, disposable ships can soak the first wave. Since explosion odds only bite once a unit drops under 70% hull, cheap high-hull-per-cost units can absorb early hits and buy your expensive ships more survivable rounds.
• Always scout before you commit. An Espionage Probe report tells you exactly what you're up against (ships, defenses, technology levels) before you risk a real fleet — never launch a full attack blind.
• Technology matters more than raw ship count past a certain point. Weapon, Shielding, and Armor Technology research scales every single unit's stats simultaneously, a well-teched smaller fleet frequently beats a larger undeveloped one.

Debris Fields, Defense Rebuilding & the Espionage-Probe Trick

• Defense structures get a second life. After a battle ends, every destroyed defensive structure (Rocket Launchers, Lasers, Ion Cannons, etc.) on the defender's planet has a 70% chance of being instantly and freely rebuilt, ships never get this.
• Only destroyed ships create a Debris Field, defenses never contribute to it no matter how many are destroyed.
• Deuterium is never present in a debris field, only metal and crystal can end up there.
• Geography favors the defender. Because the debris field forms at the defender's planet, the defender's own Recyclers usually reach it first, unless the attacker plans ahead.
• The espionage-probe debris trick: sending a single Espionage Probe as a one-round attack generates a small debris field (300 crystal) at the target immediately. Experienced attackers send Recyclers timed to arrive right after their main fleet, using this probe-generated field as cover so their Recyclers are already in position the instant the real battle's debris appears.

Try It Yourself: The OGame Battle Simulator

Reading about rounds and Rapid Fire is one thing, watching your actual fleet composition play out shot-by-shot is another. Our OGame Battle Simulator runs this exact engine, real randomized rounds, the same 1% bounce rule, the same 70%-hull explosion odds, the same Rapid Fire matrix, against any attacker/defender combination you enter, including debris field output. If you'd rather see it applied step-by-step to the simulator's interface first, our Battlesim walkthrough guide covers exactly that.

Related Guides

• Ogame Fleet vs. Defenses: How to Win the Battle
• Ogame Battlesim: How to Use Ogame's Battlesim for Better Combat
• OGame Tools: Calculators & Simulators
• OGame Espionage Guide
• OGame Defense Ratio Guide