[DiogenesLamp]

The Confederate navy was first established by seizing Union ships. I'd call those acts of war beginning months before Fort Sumter.

You are a little weak on the specifics. What Union ships were seized prior to Ft. Sumter?

But my point is that the first invasion of the Confederacy was by sea. It was that Fox expedition. I suppose the Pickens expedition counts too.

[BroJoeK]

DiogenesLamp: "You are a little weak on the specifics.
What Union ships were seized prior to Ft. Sumter?"

At times in the past I've posted long lists of Confederate seizures of Federal properties beginning in December 1860, many before those states even declared secession.
That's one of the reasons Union voters were willing to respond in April to Lincoln's call for state militia units.

Among those seizures were at least half a dozen Federal ships, especially revenue cutters.

DiogenesLamp: "But my point is that the first invasion of the Confederacy was by sea.
It was that Fox expedition.
I suppose the Pickens expedition counts too."

Absurd, typical propaganda, a resupply mission is not an "invasion" regardless of how often you lie about it.

But at that time Confederates were already invading Union states like Maryland and Missouri.