1. Speak with Taka
Talk to Taka, who you will find at the central square of Yarikawa Stronghold. He'll tell you that Yuna wants to talk to you and that you'll find her at the top of the steward's keep.
2. Meet Yuna at the top of the steward's keep
Go to the steward's keep and use the ladders to get to the top floor. There you will meet Yuna, with whom, drinking something stronger and listening to her sad story about her mother, you will spend time waiting for the Mongols to attack.
The Mongols' final assault on Yarikawa Stronghold has begun. I have to save the people of Yarikawa by any means necessary.
3. Follow Yuna / Reach the main gate / Defend the main gate
When the attack starts, run out of the keep and proceed to the main gate. When you get there, the gate will be breached and the Mongols will run into the courtyard. Start eliminating the aggressors: swordsmen, shieldmen, spearmen, and brutes. When you get rid of all opponents at the main gate, you will have to move to the right, to the northern gate, which has also been breached.
4. Defend the northern gate
This time there will also be archers shooting fire arrows. Try to eliminate them as soon as possible.
When you kill most of the enemies, the last ones will retreat, which will surprise you a little. After a while, you'll find out why they fled. Two siege machines standing on a nearby hill will start firing on the stronghold. You decide to get to those machines and destroy them.
5. Reach the Mongol siege weapons / Disable the Mongol siege weapons 0/2
How you get near the siege machines is entirely up to you. You can choose an open fight or you can try to sneak through the camp which shouldn't be very difficult as most of the Mongols will be busy attacking the stronghold. You can even go along the river to the north and bypass the Mongol camp from the right side.
When you get to the siege machines, kill the warriors who guard them and then destroy both of them.
6. Return to Yarikawa Stronghold / Reach the steward's keep
How you want to return to the stronghold is also up to you. You can use both gates, main or north one. For example, you can use a grappling hook to get to the roof of one of the tents and then walk on the rope to the roof of the burnt house. From there it should be few steps to the main gate and only a few enemies along the way.
Then proceed to the steward's keep gate and kill the Mongols around it. Then you will be able to open it and enter the courtyard where you will face General Temuge.
7. Defeat General Temuge
General Temuge is using a shield, so you should use the water stance when fighting him. He can also ignite his sword.
At the end of the fight with him, you will get a prompt to slaughter him.
When you do that, you will unlock the Ghost Stance. It's a very powerful stance that allows you to kill up to three enemies with deadly strikes. Use the right combination (L3 + R3) to activate it.
To enter the Ghost Stance, either slaughter Mongol leaders while in stealth or kill enough enemies without taking damage.
8. Drive the Mongols from Yarikawa Stronghold
Simply move towards the main gate, killing all the Mongols you meet along the way.
When it's safe, you'll make a speech that will definitely convince the Yarikawa people to help you fight the invaders.
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