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Comment by Alfa

He is summoned to your garrison with Bloodied Iron Horde Banner.

Recommended to have a group of 10-40 players.

Comment by Sunabubus

Since the summoning item is a one-time thing (and it's incredibly bugged at the moment), I will list the abilities till the database picks it up. Better than surprises.
Abilities:
Iron Leap
Whirling Axe
Chain Grasp

Move away from the Iron Leap target (or move from others if you are targeted), move from the axe, move away with the chain.

We did this with 25+ ppl, 6 healers, the damage is not significant, but 1-2 people died because lack of knowledge.

Comment by Blackace26

I can confirm that this particular boss can drop at least 2 mounts that you would normally obtain from a gold garrison invasion. Did this boss this week and one person got a Garn Steelmaw, and another got a Giant Coldsnout.

Comment by Reydra1986

It seems that the garrison bosses share some loot. I just got Scaling Hook Spaulders off of this boss and they also drop off of Teluur.

Comment by 681617

I received Bloodied Iron Horde Banner after a bronze rating garrison invasion; incidentally it was my first garrison invasion; and first Iron Horde Invasion.

Remember: you can only get loot from one garrison boss per week. We dropped a different banner after the first boss was downed, and were sorely disappointed.

Comment by jjanchan

Garrison Invasion Bosses
There are six possible garrison bosses that can be summoned. They are summoned by the items below, and are each associated with a specific type of invasion:

Heart of Oak summons Teluur, and can be obtained during a Botani invasion
Arcane Highmaul Relic summons Mage Lord Gogg'nathog, and can be obtained during an Ogre invasion
Runed Greatstone summons Gaur, and can be obtained during a Goren invasion
Bloodied Iron Horde Banner summons Commander Dro'gan, and can be obtained during an Iron Horde invasion
Legion Beacon summons Lady Fleshsear, and can be obtained during a Shadow Council invasion
Void Prison summons Annihilon, and can be obtained during a Shadowmoon invasion

Below I've compiled some information on these Garrison Invasion Bosses:

The items that summon these bosses can be received by successfully completing a garrison invasion, with ANY rating achieved (bronze, silver, gold or platinum).
The items can be obtained on your second, third, fourth etc. invasion in a week even if you have already completed an invasion that week and won all of the reward bags.
The person that has the summoning item must summon the boss from a Level 3 garrison, but it doesn't have to be their own. Anyone in the group leader's raid group and in that person's garrison can engage the boss.
The bosses are recommended to be tackled by 10-40 players, and they scale in health and abilities. In general, though, the more people that you have, the more room you have for error.
Once used, the summoning items are consumed and cannot be used again (even if you wipe!)
The bosses have personal loot tables, and drop a guaranteed 75 Garrison Resources and 75 Apexis Crystal, along with a chance to drop 645 or 660 epic gear, Arcane Crystal trading post parts, and any of the 4 invasion mounts (Garn Steelmaw, Giant Coldsnout, Smoky Direwolf or Shadowhide Pearltusk).

Note that you can obtain two mounts from a single boss - they have independent drop chances!
Although a certain mount may have dropped for you in the past, it may still drop again in the future.

The gear that drops can be Warforged, have a socket, be Indestructible (no repairs required ever), or have a tertiary stat (Leech, Speed or Avoidance).
You can only loot ONE garrison boss per week/raid lockout.

This restriction is per toon - you can kill another garrison boss in the same lockout on an alt!
Once you've killed a garrison invasion boss, "Garrison Raid Defense" will appear in your list of lockouts (Press "O", then click Raid Info at the top right of your Raid tab).

Killing all of the different raid bosses grants the achievement Master and Commander. Only the kill is required (even if someone else has summoned them).

This achievement is NOT account-wide! Therefore, while you can kill these bosses on multiple toons for chances at loot, kill credit for all 6 needs to be on a single character for the achievement.

Comment by Thelerinne

Hi!

I leave you a video of Commander's kill (Multi-PoV) with a brief explanation:

https://www.youtube.com/watch?v=tledn3CJn4w

Good luck!

Comment by BananaBomb

Commander Dro'gan is summoned by Bloodied Iron Horde Banner that can be obtained during an Iron Horde Invasion! .

Iron Horde Invasions GarInvasion_IronHorde are triggered by completing the daily quests:

Assault on Mok'gol Watchpost
Assault on the Iron Siegeworks
Assault on the Pit
Battle in Ashran

Comment by Tatyaana

I had Bloodied Iron Horde Banner for a while now and was wondering how many people were actually needed as this was one of the earlier contents in Draenor. We did it today easily with 6 people, 2 were HFC HC geared, others were in 670-690. Our composition was 1 Tank, 1 Healer and 4 DPS.