Since we are talking about Operation Blackbeard, I would like to imagine an alternate version of the operation. This was initially started after I read a negative review of Turtledove's books on the series.
In Turtledove's original version, the Second Great War started in Europe after Kaiser Wilhelm II died in early June. The USA and CSA stayed out of it until the Confederates invaded the United States on June 22, 1941. An informed fan of the series would know that this is suppose to parallel real-life Operation Barbossa. What many people do not know is that the German invasion of the Soviet Union was planned around May 15, 1941. The reason(s) why it was delayed is/are not clear to historians. There are a few theories here and there, such as preferring to attack in the summer, instead of dealing with a wet spring.
Whatever the actual reason, I would have liked for Turtledove to have written the Second Great War as a war that
begins in North America at an earlier time in May 1941, instead of Europe in Early June 1941. This may not have triggered the European powers to declare war against each other, but it would have at least made them alert and perhaps mobilized their respective armies until someone fires the first shot. Only when Germany (and its allies?) refuse to give back conquered land to France does that actually cause the Europeans to go to war with each other, again.
Even though I like the idea of the Confederacy invading through the "Neck of America" (Ohio), I wanted to see a more organized invasion in different parts of the U.S.-C.S. border.
Perhaps the Confederacy also invades U.S.-controlled Sequoyah and "liberates" it. At least for now, Sequoyah would again be under Confederate control. There should have been a description of the CSA also invading small parts of the USA that used to belong to them. I would have liked it if we got a scene or two of the Confederate military invading/attacking the Bahamas, Haiti, and Jamaica. Even if the CSA never controlled it, I like the idea of New York City being bombed by CSA planes based on that alternate book cover of Return Engagement. Another thing that I would also like to add is that, with the help of Confederate forces crossing Lake Erie, a "Free State of Canada" is established in Ontario and fights against Americans and/or Quebecois soldiers.
Granted, all of this is not taking into account of how industrialized the CSA would be, the number of Confederate soldiers involved, and the amount of fuel needed for all this to be plausible.
Source:
https://en.wikipedia.org/wiki/Operation_Barbarossa#Reasons_for_delay