This is the battle walkthrough for the mission Taking Fort Merceus from Fire Emblem: Three Houses (FETH, FE3H). Read on to find out about map features, what enemies you will encounter, and tips for winning!

Chapter 18 (Golden Deers) - Map and Overview

Chapter 18 (Golden Deers) - Enemies

Enemy Stats

Loot

Chapter 18 (Golden Deers) - Chests

There are two chests at the eastern wall. One in the north, and one in the south.

The enemy units do not hold any chest keys. You can purchase keys before battle, or if you have them in the convoy, access them from Byleth. If you have a Thief, of Assassin in your party, you can have them open up the chests using the Locktouch Ability.

Aurora Shield

Gives +3 Protection and negates bonus damage against cavalry when equipped. Even if you do not have any enemies that use Horseslayers or Dark Spikes, it gives the protection bonus of a Steel Shield with zero weight. Definitely worth getting since it isn't out of the way for Claude, especially if he is the Barbossa class.

Speedwing

Permanently increases speed by 2. Useful to have for flying units and quick units like Assassins or Thieves, as it increases dodge and attack speed. Given that it's close, you might as well get it. It can even be gotten on turn 1 if you have Lysithea warp the key bearer into the walls.

Chapter 18 (Golden Deers) - Map Features

Enemies are scattered across the large map which is surrounded by ramparts and channels; suitable for fliers.

Terrain Types

Chapter 18 (Golden Deers) - Tips and Tricks

Ally Reinforcements

At the start of the battle, there will be a cutscene which will reveal Nader and the Almyrian troops as they team up with the Alliance. Your ally units will increase to 5.

Enemy Reinforcements

On the first turn enemies will begin to spawn in 4 areas on the map (two in the north, and two in the south). To prevent them from spawning, have an ally move to the space where they are supposed to enter the battefield.

Get Rid of the Ballista and Fire Orb Users

Although each enemy unit is far, those who control the Ballista and Fire Orb, which can target units from across the map, will attack your weaker units one by one. Make sure you defeat them first before moving forward.

Surround the Death Knight

The Death Knight's range is only 1 tile in each direction. If you get near him, however, he will start to escape to the northwestern side of the map.

To prevent him from escaping and ending the battle quickly, have units surround him in every direction and focus all your attacks on him once he starts to escape.

Fire Emblem: Three Houses - Related Links

Part 2 - Verdant Wind Battle Walkthroughs

Part 2 - Verdant Wind
Chapter 13: Hunting by Daybreak	Chapter 14: Protecting Garreg Mach	Chapter 15: Ambush at Ailell
Chapter 16: The Great Bridge Coup	Chapter 17: To War at Gronder	Chapter 18: Taking Fort Merceus
Chapter 19: The Enbarr Infiltration	Chapter 20: Confrontation at the Palace	Chapter 21: Stand Strong at Shambhala
Chapter 22: For the Freedom of Fódlan