Ryse: Son of Rome

An easy way I found to defeat the dual wielding swordsmen is to just shield bash them repeatedly by tapping until you get the chance to execute them. They only block this sometimes and if you manage to get them up against a wall it is even more effective. If you are fighting two of them just focus on one of them and shield bash, and just counter the other when they go to attack (), then return to shield bashing.

The way I defeated Boudica was almost the same. Shield bash her once, then heavy shield bash her (hold ) 4 times. She will deflect the last bash, roll away when she does () then immediately shield bash her again, even if she is attacking this should stagger her so you don't get hurt. Then heavy shield bash 4 more times, roll back, repeat.

Here is a video I made to help with defeating Boudica. I had a little trouble with her trying to fight her straight up and then I remember I grabbed a bunch of those spear weapons earlier in the level. I had the max possible inventory full of them. I just chucked a bunch of them at her and defeated her with ease as you will see with my video. When I originally did this before making the video, I threw them from a greater distance and she would dodge half of them. When I made this video I was closer and she didn't dodge as much. If you have already done some levels on legendary, this level shouldn't be to bad. Be patient and smart when dealing with enemies. If you have to many coming at you at once, try dodging and running around and try to separate them to try to get an enemy one on one. If you have to many around you, you can get distracted by one guy and then hit by another. Saving your focus ability attack for big groups or tough spots is good too.

I found that for ANY dual wielder (Boudica included), it worked to attack them with Y three times... them X three times. Then roll back with B. This resets your attack on the enemy you're facing.
Then you can immediately repeat the above attack.
I even got a flawless victory against Boudica this way.