Anglo Norman Invasion Of Ireland Puns

After playing lots of Crusader Kings 3, I recently learned about the existence of the Laudabiliter papal writ, which in the game acts as a cause for the English monarch to invade and govern "the barbarous tribes of Ireland" in perpetuity.

As someone who grew up in Northern Ireland I'd never heard of this thing. Was it particularly important for the Anglo-Normans to have Papal backing when they invaded Ireland? Were they going to anyway? Was there any comment on how ... dehumanizing it depicts the Irish as?

I have enjoyed the old tales and sagas, but when it comes to modern, well researched studies on campaigns during this era, I’m having a hard time finding good sources. I’m primarily looking for information on

1. What were the major tactics used in battles and raids during this era? Major arms and armor, and how they were employed. Was the shield wall and it’s ebb and flow predominant, or did we see more major maneuver and positioning of troops.

2. Logistics are huge for me. From “Feeding Nelson’s Navy” to “Alexander and the logistics of the Macedonian Army”, I am obsessed with military logistics, and how it absolutely drives the strategy employed in campaigning. Are there any good studies on the logistics used to supply armies in the field during this time? Were armies raised around fighting seasons, keeping men home during harvests, or year round?

I really enjoy history that gets muddied by myth. I think that the period of England before and during the time of Alfred the Great is really interesting and I'd like to read a good book about it.

Also any early Irish history is of great interest to me as well.

I find the Statues of Kilkenny very perplexing. The bilingual Anglo-Norman rulership of England demanded that their cousins and comrades who settled in Ireland renounce any Irish customs. Although this document specifically decries the decline of English among the Norman nobility of Ireland, it was written in court French. This seems like a bizarre paradox.

If the Anglo-Norman nobility were a bilingual class whose ancestors assimilated into the customs of the subjugated English whilst keeping up some aspects of Norman culture, why was it considered disastrous for this exact same process to happen in Ireland?

Were there political motivations to keep the nobility of Ireland culturally alike to the nobility of England, or was there some kind of proto-racism that deemed Irish culture to be inferior to English and French cultures?

Anglo-Saxon slavery always puzzled me, given that slavery was on the decline throughout most of Christendom, but the British Isles were the exception, and in fact they largely had fellow Christians as slaves, unlike the rest of medieval Christendom. How come slavery persisted so long in Anglo-Saxon society, that even on the eve of the battle of Hastings, it was so prevalent? Had the Normans not invaded England, would it have declined in the next two centuries? Why did the church in England not condemn the practice of enslaving fellow Christians in its entirety, like it did on the continent? If I have any misunderstandings, please let me know. The secondary sources tend to be very recent, given how English historians wanted to, by and large, bury this subject.

This claim was a comment on here I read long ago, so it may not be accurate - but I still find it a very interesting claim nonetheless.

Also, when the Normans invaded and conquered Anglo-Saxon England why didn't England become a territory of Normandy / France?

Here's a link to a pdf

https://scholarworks.harding.edu/cgi/viewcontent.cgi?article=1016&context=tenor

I was reading about the Varangian Guard and there was mention of an influx of Anglo-Saxons joining after the Norman Invasion. Specifically, it stated that in 1088 around 5000 Anglo-Saxons emigrated to the Byzantine Empire in 235 ships. Was this just one example of an organized departure from England?

Was just wondering how consistent it was throughout the island since there were so many clans and many different kings. If I were to travel from say, Waterford to Donegal, would legal statutes be the same or similar in each place?