He reacted to the evacuation of the garrison by calling for 75,000 volunteer troops.
This provoked four more states into joining the Confederacy - and the war was firmly on.
Fort Sumpter was in South Carolina.. I THINK
Fort Sumpter
The name is Fort Sumpter but I don't know if it was on a mountain or whatever.
Lincoln asked them to return, but they refused. So he waited. It wasn't until the south attacked Fort Sumpter that Lincoln declared war.
1861
Fort Sumpter
Charleston, SC
Charleston Harbour
1860
The confederates
Major Anderson
P.G.T. Beauregard