You don't, there wasn't such a thing as a 'battle ship'
you might say 'mighty ship' which, in present tense, would be 'skip maetti' or 'maetti skip'. Or you could add the definitive article to give 'skipit maetti'.
The 'a' and 'e' of maetti should be squished together to form one letter.
'Silfr' is how you say silver in Old Norse.
Friend in Old Norse is "vinr."
Týr's bradnr is how you would say 'Tyr's Blade' in Old Norse.
James is translated to "Jakob" in Old Norse.
In Old Norse, the word for book is "bók."
Asgard would be ''Ásgarðr'' in Norse.
In Old Norse, you can say "Vel gert" for good job or "Hælla" for congratulations.
In Old Norse, "peace be with you" can be translated as "fríðr sé með þér."
There are at least five ways to say 'people' in Old Norse. firar folk lio lyor thjoo
Greetings in Old Norse is typically expressed as "heill" or "heill ok sæll".
In Old Norse, the name Shaun would likely be spelled as "Sjónn" or "Sjónnr."
By mækir and hlíf is how you say 'By Sword and Shield'. There is no Old Norse words for 'and' and 'the'. You have to improvise.EDIT: Mækir eða hlíf.