Combat Overview
Combat TargetsThere are 4 types of valid combat targets that you can find in System view.1. Roaming hostile ships – these ships will have red labels.2. Mission combat targets – these ships will have yellow labels and a Mission marker.3. Other players’ ships – these ships will have blue labels.4. Other players’ stations – these will be placed around housing planets in some Systems.Attacking a TargetSelect a target on the System map to open a preview window of your target. Tap on the ATTACK button to send your selected ship to attack that target. Only targets that you can attack will have an ATTACK button in the preview window.Player vs. Player Ship CombatAny ship is vulnerable to player attacks if it is roaming around or idle in System view. You will not be able to attack another player’s ship until your Operation building reaches a certain level. You’ll not be able to attack players whose Operations is too low or too high from your own Operation level. Player vs. Player Station CombatTap a station to attack it with your selected ship. stations have their own defense and they’re also defended by any ships that are currently docked there. It may take you multiple tries to defeat a station. Once a station has been destroyed, a peace shield will automatically be activated, preventing further attacks.You’ll not be able to attack another player’s station until your Operation building reaches a certain level. You’ll not be able to attack stations that belong to players in your Alliance.============================================================
Station Combat
Once you progress far enough into the game, other players can attack your station. When another player attacks your station, they will be fighting against your Defense Platform(s) as well as any of your combat ready ships that are currently docked. Ships that are being repaired or upgraded cannot participate in combat.If an attacking ship successfully destroys a station, the victorious attacking ship will fill its cargo with as many resources as it can carry. A certain amount of resources are protected by your Resource Vault (module upgrade-able in your station interior), these resources cannot be stolen by another player. A peace shield is automatically triggered around that station that has been destroyed – protecting it from any additional attacks for a short period of time. If an attacking ship fails to destroy a station (and is in turn destroyed by the station’s defenses), that ship is destroyed and automatically returned to its own station drydock.============================================================
Peace Shields
Peace shields prevent enemy ships from attacking your station. All peace shields dissipate over time. If you have a peace shield active, a timer next to a peace shield icon on the right side of your screen will indicate how much time you have before your shield deactivates. 
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Star Trek™ Fleet Command GAME GUIDE