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Ogre Invasion
Successfully complete an Ogre garrison invasion.
The Ogre Invasion achievement is earned by successfully completing an Ogre garrison invasion, which you can reliably trigger by purchasing and completing a 
Scouting Missive: Stonefury Cliffs from Sergeant Crowler.
Buy the Scouting Missive
Purchase the Scouting Missive: Stonefury Cliffs from Sergeant Crowler in your Garrison. This specific missive is the one that triggers the Ogre Invasion.
Complete the Missive Quest
Accept and complete the quest provided by the Scouting Missive: Stonefury Cliffs, then return to your Garrison and hand it in to be offered the Ogre Invasion.
Complete the Ogre Invasion
Accept and complete the Ogre Invasion at your Garrison to earn the achievement. Performing well during the invasion grants better reward tiers: Bronze, Silver, Gold, and Platinum.
Tips
Use this macro to check which invasion reward tiers you have already claimed this week:
/run for k, v in pairs({Silver=37639,Bronze=37638,Gold=37640,Platinum=38482}) do print(format("%s: %s",k, C_QuestLog.IsQuestFlaggedCompleted(v) and "|cFFFF0000Done|r" or "|cFF00FF00Not done|r")) endSee the video guide for a full walkthrough of the invasion.