Constant artillery barrel fire.
Explanation:
- In early April 1861, North Carolina authorities demanded that the Union Army leave Fort Sumter, a fort located in an area that was no longer considered part of the Union.
- The Union refused to relinquish the fort, and when the deadline for the ultimatum passed, the Confederate army launched an artillery barrage, which lasted until the surrender of the fort.
- No direct life was lost on either side in direct conflict.
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