Very good video, Birka Viking.
There's just one thing thats not perfect:

the music is far away from being brutal enough.
How about some Agathocles, Haemorrhaege or Nasum?

[serious] The music fits nearly perfect. There's only one band, that would do a better job for this video:
Bolt Thrower. Especially "the 4th crusade" from the album with the same title.
[/serious]