Foot said that Vikings from Ireland perhaps I should clarify that commonly used the Mersey as an entry point Olaf an invader at Brunanburh came from Ireland I do see any need to have an exact date here as that would be a strange detail Example Between XXX XXX Vikings from Ireland used the Mersey as a common entry point What if they always used it as a common entry point I think Foot is rather strongly implying that they were using it at the time of the battle of Brunanburh So the point is that Vikings from Ireland used it as a common entry point and since Bromborough is near the Wirral this is another piece of evidence for a battle site at Bromborough In regard to your last paragraph it is not permitted by policy to completely base this article on primary sources especially when trying to get an article to GA and I tried very hard to maintain a good balance on that We are also to give due weight to opinions and apparently even Michael Wood a person who has argued for alternative sites said that Bromborough is becoming the accepted location