I think that the motive behind her attack was to ensure the throne goes to Bjorn. She is far too rational to be swept away by jelousy. Besides, this seems to have been very well planned. We will have to wait a little while to find out, I believe.

I believe that Lagertha's attack has more to do with ensuring that the throne goes to Bjorn rather than taking revenge from Aslaug. If you think it that way, it makes sense, taking into consideration that she has always been a very down-to-earth woman, unlikely to do "crazy" things. (Sorry about my English, but it's…

I agree with you. I was surprised to see how Kattegat had grown when Ragnar returned