The Northern Forces under Abner Doubleday occupied the Southern owned Island of Ft. Sumter. This would be akin to the South invading and taking Governor’s Island in New York Harbor.
And, yes, it was that Abner Doubleday.
sounds like he hit a home run
Except that the Army troops were under the command of William Anderson, not Abner Doubleday. And Sumter was built on land deeded to the Federal government free and clear by act of the South Carolina legislature. So your Governor's Island comparison doesn't work.
Captain Doubleday reported to Major Anderson at Fort Moultrie. It was Anderson that ordered the U.S. troops relocated to Sumter