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Silver Defender
Successfully complete a garrison invasion with a Silver rating or better.
Silver Defender is a 5-point achievement earned by completing a Garrison invasion with a Silver rating or better, requiring at least 600 Victory Points for the Iron Horde invasion type.
Trigger a Garrison Invasion
Kill level 100 mobs in Apexis Crystal Quest areas to have a chance at triggering an invasion against your Garrison. Once triggered, pick up the invasion quest from the NPC in front of your Town Hall (Grimjaw for Horde players).
Bring Additional Players
Recruit at least one other player and an additional follower or bodyguard before starting the invasion quest. Spreading out across your Garrison to cover different areas makes the defense significantly easier and increases your Victory Point total.
Reach 600 Victory Points
Earn Victory Points by killing normal combatants (3 VP each) and special combatants such as snipers or siege engines (20 VP each). Keep your Garrison buildings intact, as surviving buildings award bonus points at the end — reaching 600 VP earns the Silver rating and unlocks the Silver Defender achievement.
Tips
Do not kill the final boss (the Horde Commander for Iron Horde invasions) until you have confirmed you already have enough VP, as the achievement may trigger before the Commander's kill points are counted, potentially leaving you with only Bronze Defender despite finishing above 600 VP.