Hmmm...I seem to remember a number of incursions by the rebels into Union territory.
nor did it pose any serious threat to it.
Yeah, sure. The ring of forts and thousands of troops around the national capital were put there for no reason at all.
If the Union had temporarily moved its capitol to New York they would have freed up about 30k troops. But symbolism won over common sense.
Yeah, sure. The ring of forts and thousands of troops around the national capital were put there for no reason at all.
Okay, I see your problem. You are a time traveler and you can't keep your historical events in the proper order. You've got this happening before that, and this subsequent thing in front of that other triggering event.
Your sequence is all out of whack.
At the time the Union invaded, the South was not posing any threat to them. The South was not going to invade. Later? Yeah, it's sort of what you have to do when you go on an offensive in a f***ing WAR.