Asking when did a Southern soldier invade a Northern home, but then expressing incredulity by framing things in terms of state entities that were either north or south and acting at a state level is a bit of a false dichotomy, but also looking at the wrong level of entity for the claim. Between the most Northern states and most Southern were border states where there was chaos and violence. The Southern strategy was also initial aggression followed by defense, but there were exceptions.
West Virginia and Kentucky
Recall West Virginia separated itself from Virginia and officially took a pro-Union position, but a full 1/3 of its citizens were either pro-slavery or pro-Confederate. Nearby Kentucky was more pro-Union. Recall level of violence from Hatfield and McCoy feud...More on Kentucky...
Wiki
Kentucky, being a border state, was among the chief places where the "Brother against brother" scenario was prevalent. Southern sympathizers in Kentucky had already seceded[2] and joined the Confederacy,[3] but had been unable to enforce their rule over the state's territory. Kentucky officially declared its neutrality at the beginning of the war, but after Confederate General Leonidas Polk unwisely decided to occupy Columbus in 1861, the legislature petitioned the Union Army for assistance. After early 1862 Kentucky came largely under Union control. But Kentucky also had a star on the Confederate flag, and seats in the Confederate Congress.
There would have been all kinds of violence in border states, within states, anger, ...
Fort Sumter
Fort Sumter already mentioned as a Confederate aggression.
The southern strategy was to seize federal forts and defend because they had a slave economy, not a manufacturing economy.
Washington, D.C.
Wiki
The strenuous effort failed, and the war started in April 1861.
At first, it looked as if neighboring
Virginia would remain in the Union. When it unexpectedly voted for secession, there was a serious danger that the divided state of
Maryland would do the same, which would totally surround the capital with enemy states. President
Abraham Lincoln’s act in jailing Maryland's pro-slavery leaders without trial saved the capital from that fate.
Faced with an open rebellion that had turned hostile, Lincoln began organizing a military force to protect Washington. The
Confederates desired to occupy Washington and massed to take it. On April 10 forces began to trickle into the city. On April 19, the
Baltimore riot threatened the arrival of further reinforcements.
Andrew Carnegie led the building of a railroad that circumvented Baltimore, allowing soldiers to arrive on April 25, thereby saving the capital.
The capital became well-defended. Later in the war...
The capital's defenses, for the most part, deterred the
Confederate Army from attacking. One notable exception was during the
Battle of Fort Stevens on July 11–12, 1864 in which Union soldiers repelled troops under the command of Confederate
Lieutenant General Jubal A. Early. That battle was the first time since the
War of 1812 that a U.S. president came under enemy fire in wartime when Lincoln visited the fort to observe the fighting.
Maryland and Pennsylvania
Maryland was a fairly pro-slavery state but stayed with Union. The Confederacy invaded Maryland fought bloodiest battle of the war, Antietam.
The South wanted foreign help because of their resource problem. They thought a big win in Pennsylvania would convince Frenchies to assist. That is one reason why Gettysburg was invaded by the Confederacy. Another reason was to make the North lose morale.
During this further Confederate aggression, they forced white Union civilians to give up property and livestock, reimbursing with unwanted Confederate money. Black Union civilians, on the other hand,--free people--were sent South to become property. More rape and murder.
That's aggression against the North, including civilians, isn't it?
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