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Chapter 10: Unhappy Reunion- Nohr Route
X's are 50 hp partitions
This is a chapter where you are under a lot of pressure to defend from multiple angles of attack. All enemies move from the start except Takumi and his retainers. There are many reinforcements that spawn this map and at the end of turn 6, Takumi will activate the dragon vein (assuming he is alive) removing all of the water from the map, turning the tiles into plains tiles and his retainers will begin to move.
Before turn 7, it is important to send someone to the left: ideally a 2 range unit that can attack over the barricade, and 1-3 people to the top right, however most of your army should likely hold the middle of the map where many enemies will attack from. Try to push your army out so that you don't get overwhelmed too much by enemies when Takumi uses the dragon vein.
Oboro won't move until turn 7 unless there is a unit in range of her or a unit she can dual strike with. She has very solid all around stats, and she will seal your strength and defense if you don't kill her on your attack. She has no real weaknesses other than being 1 range, however if you give Camilla an iron axe, she can kill Oboro in one round.
Hinata won't move until turn 7 unless there is a unit in range of him or a unit he can dual strike with. He has strong attacking stats, however his res is very low. The combination of darting blow, armored blow and triple threat makes it hard for physical uints to kill him, even Camilla is not very good against him because she has low hit and takes a lot of damage from triple threat. Corrin can be very good at killing him because his dragonstone deals magic damage and ignores triple threat and armored blow, otherwise weakening Hinata from 2 range, especially mages and your butler/maid will make short work of him.
Killing Takumi before he uses the dragon vein is possible especially if you have a strong Corrin paired up with Camilla, however it is very difficult as he has an Elixir and wary fighter and there are many enemies. Just end your turn in front of Takumi, hopefully with a shield gauge ready and counter attack, then kill him next turn. He drops an elixir, however if he is low or a nearby unit is low they will use the elixir.