This is hyperbole, one really large country dividing into two big countries is hardly falling apart.
The Union Army was the largest Army in the world followed in size by the Confederate States Army.
The CSA Army could have destroyed any European Army at the time.
Sure. One reb could whup fifty Prooshians. What the Southerners thought about their army was a lot like what the French thought of theirs at about the same time.
Your comment's silly. If the Prussian Army somehow showed up in Virginia, they'd lose. Ditto if the Confederate Army landed in Niedersachsen.