[DoodleDawg]

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.

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.

[Bull Snipe]

Except that the Army troops were under the command of William Anderson

Actually that would be Major Robert Anderson.