Well I am almost done with the part about nouns in "A new introduction to Old Norse"

but there is something i dont get

Jarl kom út í eyjarnar

why is it in genitive, and why is í used instead of til?
if eyja have to be in genetive?



Þórsteinn lagði fœð á Austmannininn. Ok fór hann á brott um summarit, ok er hann nú ór sögunn

I am not sure of why Austmaðr have to be in accusative.



Þeir eru vanir at halda til móts við höfðingjana

and I am not sure of what this sentence acually means, and why höfðingi have to be in accusative :b

I know it is a bit much. but thanks =)