I've been holding off on doing an analysis of the South Virginian/North Carolinian campaign for a while now, and most likely will continue to do so until we take Raleigh, as I've judged it as the logical culmination of our offensive, and, I suspect, where our foe will finally be forced into a decisive clash. That being said, there's a lot to look at. I really enjoyed the Three Day Siege because it was a completely unique event generated by our strategy and Skrev's worldbuilding, which made it fascinating to explore the implications. This also obviously applies to the subsequent campaign, and it's one we've been engaging in for quite some time, meaning a great deal of content has been accumulated with noticeable patterns in strategy and behavior on both sides.
It's hard to say anything definitive without knowing the conclusion, but I've been spending quite some time trying to get into the head of our opponent 'Pierre Gustave Toutant-Beauregard,' who OTL was most famous for nominally participating in the first battle of the war, fighting with Jefferson Davis, and proving an incredibly talented defensive general during (ironically) the Siege of Petersburg. He has been put into a rather difficult situation, needless to say - fighting an opponent who has both more and better quality troops than you do is what military intellectuals colloquially describe as "losing." That being said, through excellent use of defensive terrain and an absolutely ferocious performance by the undersupplied Confederate troops, Beauregard has gone three rounds counting with us and each of them were a remarkably close affair. That's not to say Yates hasn't continued to live up to his hype - he's similarly adapted his strategy to face this tenacious foe, in particular maximizing the use of his superior numbers to operationally overwhelm the rebels and never being afraid to broaden the front further, with our grand repositioning to Bern being the quintessential example of this.
As has been mentioned, cavalry has played an absolutely massive role in this campaign as well, with both Hampton and Buford constantly going at it all across over two states. Their efficacy has considerable strategic and doctrinal implications which are likely to be brought up within the context of the quest as the Union grasps for the best way to use it's mounted units.