Chris C., Superb YouTube film in Post 99 and the main speaker Major Jason Geroux has a longer, more detailed explanation of the same battle on YouTube (2hrs) from December 2020 (not viewed yet): His 2020 Masters dissertation is Urban Battle of Ortona, taken at the University of New Brunswick, is free to download as a PDF (226 pgs). The Abstract states: Link: The urban battle of Ortona | UNB Scholar
Just found that in January 2023 Major Geroux was a guest speaker on the US Modern Warfare Institute (@ West Point), yes on Ortona. I spotted when looking at a very recent podcast on artillery in the Ukraine war and there is a long list of their podcasts, scroll down it is there. Not listened to today. Link is 45mins long: Artillery in the Urban Battles of Ukraine - Modern War Institute Update: listened to the podcast and to be fair the YouTube is far better, as it has imagery and maps.