What was the impact of the Battle of Fort Sumter for both the Confederate and Union army? Was it more impactful for one side or the other?

The Battle of Fort Sumter was the first battle of the American Civil War ... seceded from the Union, while the North considered the fort to be part of the U. S. government ... Confederate troops then occupied Fort Sumter for nearly four years, ... A number of other U. S. military facilities in the Deep South had ...